Preservation is an important concept in the field of appellate review. Lack of preservation often forecloses review of an issue on appeal. In the criminal context, there are, however, some important exceptions to the preservation requirement. One of those exceptions is a challenge to an unlawful sentence. This "is a narrow exception to [the] preservation rule permitting appellate review when a sentence's illegality is readily discernible from the trial record." People v. Santiago, 22 N.Y.3d 900, 903 (2013). In a recent case, People v. Lashley, 37 N.Y.3d 1140 (2021)), decided Dec. 14, 2021, the Court of Appeals rejected application of the illegal sentence exception where a defendant claimed that an enhanced sentence based upon a predicate felon adjudication was illegal because the prosecution relied on a facially insufficient predicate statement. The statement failed to set forth the necessary tolling period for a predicate conviction that was over 10 years old. The Court of Appeals' short memorandum decision in Lashley provides limited guidance as to why the illegal sentence exception did not apply in that scenario. This article aims to clarify the impact of Lashley on the illegal sentence exception to the preservation requirement where there is a claim of illegal predicate felon adjudication.