Defendant was convicted of armed robbery and possession of a firearm during the commission of a felony. Because the presentence report failed to show that defendant had a prior felony-firearm conviction, the felony-firearm sentence imposed was a two-year consecutive sentence. When the trial court learned of the inaccuracy in the presentence report the court, sua sponte and without affording defendant a resentencing hearing, enhanced the felony-firearm sentence to five years as statutorily mandated. The Court of Appeals affirmed the increased sentence.
We reverse in part and affirm in part the judgment of the Court of Appeals. We remand for resentencing only with regard to the armed robbery conviction and hold the modification of the felony-firearm sentence to be harmless error because defendant admits the prior felony-firearm conviction.
i
Armed with a gun, defendant robbed a Detroit grocery store in April 1992. He was charged with armed robbery1 and with possession of a firearm during the commission of that felony.2 The presentence report stated that he faced a two-year consecutive prison term for the felony-firearm charge.
*93In February 1993, defendant pleaded guilty as charged. This was a negotiated plea, and the terms of the bargain were placed on the record. During the plea proceeding, the trial court told defendant that he would serve two years in prison for felony-firearm.
In preparation for the March 1993 sentencing, the trial court received a presentence report that listed no prior felony-firearm conviction for defendant. Neither party challenged this portion of the report.
The trial court then sentenced defendant to a term of six to fifteen years in prison for armed robbery.3 Believing that it was defendant’s first felony-firearm conviction, the court imposed the two-year mandatory consecutive term.
Six weeks later, an employee of the Department of Corrections sent a letter to the trial court stating that defendant had previously been convicted of felony-firearm. The employee stated that, as a second felony-firearm offender, defendant should be serving a five-year term rather than a two-year term.
The trial court informed the Department of Corrections that it could not locate a record of a prior felony-firearm conviction. In response, the department provided a docket number, a date, and the name of the sentencing judge.
In the meantime, defendant had timely requested the appointment of appellate counsel. In April 1993, the court entered an order appointing counsel.4
*94The trial court then entered an amended judgment of sentence, providing that defendant would serve a five-year term of imprisonment for felony-firearm.5 The amended judgment was entered without notice to either party and without a resentencing hearing.
On appeal, defendant argued that he should be resentenced,6 but the Court of Appeals affirmed.7 This Court granted defendant’s application for leave to appeal.8
n
The question presented is whether the trial court had the authority to modify defendant’s felony-firearm sentence from two to five years, sua sponte and without a resentencing hearing, when it learned after sentencing that defendant had previously been convicted of felony-firearm.
Defendant does not challenge the existence of the prior felony-firearm conviction. Instead, he argues that he is entitled to resentencing because the trial court should have been required to reconsider the length of his consecutive indeterminate sentence when it enhanced defendant’s felony-firearm sentence to five years. The prosecutor correctly characterizes defendant’s appeal as an attempt to raise the question whether a trial court should consider the effect of the length of a mandatory sentence when setting a consecutive indeterminate sentence.
*95Although this issue has been addressed by the Court of Appeals, this Court has not addressed this question directly. The Court of Appeals in People v Warner, 190 Mich App 734; 476 NW2d 660 (1991), held that where a defendant receives consecutive sentences and neither sentence exceeds the maximum punishment allowed, the aggregate of the sentences will not be disproportionate under People v Milbourn, 435 Mich 630; 461 NW2d 1 (1990).9 In effect, Warner treats each sentence separately under Milboum’s principle of proportionality.10 Under Administrative Order Nos. 1994-4 and 1996-4, 445 Mich xci and 451 Mich xcii, Warner is controlling. We find Warner’s reasoning persuasive and hold that a sentencing court need not consider the length of a consecutive or concurrent mandatory sentence when setting an indeterminate sentence.11
In so holding, we overrule People v Davis, 196 Mich App 597; 493 NW2d 467 (1992), to the extent that it held a sentencing court must consider the effect of the length of the sentence of a mandatory felony-firearm conviction when sentencing the underlying felony. Davis’ attempt to distinguish Warner is not persuasive. Id. at 602, n 2.
*96III
Although the authority of the court over a defendant typically ends when a valid sentence is pronounced, the court may correct an invalid sentence after sentencing. In re Jenkins, 438 Mich 364; 475 NW2d 279 (1991); People v Barfield, 411 Mich 700; 311 NW2d 724 (1981); People v Fox, 312 Mich 577; 20 NW2d 732 (1945). This established rule is restated in MCR 6.429(A):
The court may correct an invalid sentence, but the court may not modify a valid sentence after it has been imposed except as provided by law.
Thus, it is necessary to address whether the underlying sentences were invalid.
A
A sentence is invalid when it is beyond statutory limits, when it is based upon constitutionally impermissible grounds, improper assumptions of guilt, a misconception of law, or when it conforms to local sentencing policy rather than individualized facts. People v Whalen, 412 Mich 166, 169-170; 312 NW2d 638 (1981). This Court has also repeatedly held that a sentence is invalid if it is based on inaccurate information. People v Triplett, 407 Mich 510, 515; 287 NW2d 165 (1980); Whalen, supra at 170; People v Eason, 435 Mich 228, 233; 458 NW2d 17 (1990).
In this case, the information in the presentence report was inaccurate because it failed to disclose defendant’s prior felony-firearm conviction. A line of Michigan cases hold that sentences based on inaccurate information are invalid. People v Lauzon, 84 Mich App 201; 269 NW2d 524 (1978) (the trial court *97erred when it sentenced the defendant under the mistaken belief that he had committed a burglary while out on bond); People v Corlin, 95 Mich App 740; 291 NW2d 188 (1980) (the presentence report erroneously stated that the defendant had pleaded guilty of possession, which carried a maximum penalty of two years, rather than delivery, which carried a maximum penalty of seven years); People v Hale (After Remand), 106 Mich App 306; 308 NW2d 174 (1981) (error was found because the defendant’s cooperation with the police was not made known to the court at the time of sentencing); People v Hildabridle, 45 Mich App 93; 206 NW2d 216 (1973) (it was error for the court to sentence the defendant on the basis of inaccurate information regarding the value of the stolen property).
The statutory requirement that the court review a presentence report before imposing a sentence underscores the importance of accuracy in sentencing. MCL 771.14; MSA 28.1144. Presentence reports “inquire into the antecedents, character, and circumstances of the person,” MCL 771.14(1); MSA 28.1144(1), and are integral to sentencing, People v Brown, 393 Mich 174; 224 NW2d 38 (1974) (reasoning that a defendant cannot waive his right to a presentence report). They are intended to insure that the punishment is tailored not only to the offense, but also to the offender. People v Triplett, supra at 513-515.
The staff comment accompanying MCR 6.429(A) states, “ ‘[i]nvalid sentence’ refers to any error or defect in the sentence or sentencing procedure that entitles a defendant to be resentenced or to have the sentence changed.” Although the staff comment *98seems to anticipate that a sentence will be invalid when the error operates against a defendant, sentences have been held invalid even when the error operated in a defendant’s favor.12 A sentence may be invalid no matter whom the error benefits because sentencing must not only be tailored to each defendant, but also satisfy “society’s need for protection and its interest in maximizing the offender’s rehabilitative potential.” Triplett, supra at 513 (citations omitted).
Because of the importance of accuracy in sentencing we find that the original felony-firearm sentence was invalid and subject to modification by the trial court under MCR 6.429(A). Because the armed robbery sentence was based on the same inaccurate information, we also hold it invalid under MCR 6.429(A). However, the question remains whether in this case it was error for the trial court to increase defendant’s felony-firearm sentence and implicitly reaffirm the defendant’s armed robbery conviction sua sponte and without affording defendant an opportunity to challenge the new information at a resentencing hearing.
B
MCR 6.429(A) does not specify procedural safeguards that must be afforded a defendant when an invalid sentence is modified.13 Certain sentence modi*99fications of invalid sentences are ministerial in nature and do not require a resentencing hearing;14 however, other modifications require the due process protections of a resentencing hearing.
For example, the majority of cases presume that the correction of a sentence found invalid because of inaccuracies in information relied on at sentencing will occur at a resentencing hearing. See, e.g., People v Lauzon, People v Hale, People v Hildabridle, and People v Corlin, supra. Such a conclusion is consistent with the fact that sentencing is a critical stage of the proceedings at which the defendant has a Sixth Amendment right to be represented by counsel. People v Pubrat, 451 Mich 589, 594; 548 NW2d 595 (1996).
The circumstances of this case are unique, given the fact that the inaccuracy involved a mandatory sentencing scheme under which the trial court had no discretion. The felony-firearm statute states:
A person who carries or has in his or her possession a firearm when he or she commits or attempts to commit a felony, except a violation of section 223, section 227, 227a or 230, is guilty of a felony, and shall be imprisoned for 2 years. Upon a second conviction under this section, the person shall be imprisoned for 5 years. Upon a third or subsequent conviction under this subsection, the person shall be imprisoned for 10 years. [MCL 750.227b(l); MSA 28.424(2)(1).]
This statute requires proof beyond a reasonable doubt that a defendant carried a firearm during the commission or attempted commission of a felony and nothing more. Similar to the enhancement provision of the *100controlled substances act, whether a defendant was a first-, second-, or third-time offender under the felony-firearm act affects only the duration of the defendant’s sentence.
Due process protections afforded defendants subject to such sentence enhancement provisions are less than those afforded defendants for the substantive offense, because the enhancement is not a separate element that must be proved beyond a reasonable doubt. People v Eason, supra at 233. Applying People v Eason, the Court of Appeals in People v Williams, 215 Mich App 234, 236; 544 NW2d 480 (1996), held that for enhancement of a felony-firearm sentence “due process is satisfied as long as the sentence is based on accurate information and the defendant has a reasonable opportunity at sentencing to challenge that information.” We agree.
Despite the fact that the inaccuracy in this case involved a mandatory enhancement provision with unique due process considerations, we hesitate to declare the sentence modification at issue purely ministerial because defendant’s armed robbery and felony-firearm sentences were based on inaccurate information in the presentence report. Therefore, we hold that the trial court erred when it modified defendant’s felony-firearm sentence and implicitly resentenced defendant to the same prison term for armed robbery sua sponte and without a resentencing hearing.
IV
In conclusion, we consider the effect of the unique circumstance of this case, that defendant admits the accuracy of the prior felony-firearm conviction, with *101respect to both the felony-firearm sentence and the armed robbery sentence.
Regarding the felony-firearm sentence, because defendant admits the accuracy of the prior felony-firearm conviction and because the sentencing court was bound by the enhancement provision of MCL 750.227b(l); MSA 28.424(2)(1), it is unnecessary to resentence the defendant for the felony-firearm sentence conviction on remand. All challenges to the felony-firearm sentence are moot, and the court’s failure to afford defendant a resentencing hearing when it amended the sentence was harmless error.
However, because the armed robbery sentence was based on inaccurate information in the presentence report, the defendant does have a right to be resentenced at a resentencing hearing with respect to the armed robbery conviction. On remand, the trial court may consider the new information regarding the prior felony-firearm as it chooses. The court may raise or lower the armed robbery sentence, or it may leave the sentence unchanged. And we repeat, the court is not bound to consider the length of the consecutive mandatory sentence for felony-firearm under Milbourn’s principle of proportionality because each sentence is a separate determination.
The judgment of the Court of Appeals is affirmed in part and reversed in part.
Mallett, C.J., and Brickley and Riley, JJ., concurred with Weaver, J.MCL 750.529; MSA 28.797.
MCL 750.227b(l); MSA 28.424(2)(1).
The sentencing guidelines were initially computed at two to six years, and the trial court advised defendant that if he accepted the plea, he would he sentenced within that guidelines range. When the guidelines were actually calculated, however, the range was four to twenty years.
Under MCR 6.425(F)(3), this order constituted a timely claim of appeal.
Again, this sentence would be served before the six- to fifteen-year sentence for armed robbery.
The defendant did not attempt to withdraw his plea and did not challenge the accuracy of the prior felony-firearm conviction.
Unpublished opinion per curiam, issued July 12, 1994 (Docket No. 164256).
451 Mich 896 (1996).
Milboum articulated the principle of proportionality, a standard applied when reviewing whether a sentence challenged as excessive actually comports with the seriousness of the offense and the offender.
See also People v Kent, 194 Mich App 206; 486 NW2d 110 (1992), and People v Landis, 197 Mich App 217; 494 NW2d 865 (1992).
A similar issue was addressed by this Court in People v Thomas, 447 Mich 390; 523 NW2d 215 (1994), in which this Court, applying MCL 769.24; MSA 28.1094, held that a partially invalid sentence need not be wholly annulled, but rather may be set aside only in respect to the unlawful excess. Although there was no “unlawful excess” at issue in this case, the principle of Thomas, that even the maximum and minimum terms of a sentence may be adjusted independently, is even more logical when applied to adjustments of sentences for separate convictions.
In People v Corlin, supra, the court initially sentenced the defendant for possession of a controlled substance carrying a twelve-month term, but then realized that the conviction was of delivery of a controlled substance carrying a three- to seven-year term.
Certain modifications of valid sentences may be made “as provided by law.” For example, a trial court may modify a sentence under MCL 769.11b; MSA 28.1083(2), Michigan’s sentence credit statute, and under MCL 801.257; MSA 28.1747(7), authorizing trial courts to reduce a sentence by one-quarter for good conduct.
See, e.g., People v Maxson, 163 Mich App 467; 416 NW2d 247 (1987) (holding the fixing of a maximum sentence is a ministerial act).