qmlcachegen is crashing

I recently updated from 6.9.0 to 6.9.1. Now when I compile my project, I get a crash in qmlcachegen. I've attached the crash report. Partial stack trace (of release-build qt6):

Stack trace of thread 45454:
#0  0x00007fd39ad17214 n/a (libQt6QmlCompiler.so.6 + 0x2c214)
#1  0x00007fd39adc4bfb n/a (libQt6QmlCompiler.so.6 + 0xd9bfb)
#2  0x00007fd39adcd03f _ZN19QQmlJSImportVisitor23checkRequiredPropertiesEv (libQt6QmlCompiler.so.6 + 0xe203f)
#3  0x00007fd39adc2a7f _ZN19QQmlJSImportVisitor8endVisitEPN6QQmlJS3AST9UiProgramE (libQt6QmlCompiler.so.6 + 0xd7a7f)
#4  0x00007fd39ad97892 n/a (libQt6QmlCompiler.so.6 + 0xac892)
#5  0x00007fd39ae8381b _ZN18QQmlJSTypeResolver4initEP19QQmlJSImportVisitorPN6QQmlJS3AST4NodeE (libQt6QmlCompiler.so.6 + 0x19881b)
#6  0x00007fd39ad7f590 _ZN17QQmlJSAotCompiler11setDocumentEPKN5QmlIR9JSCodeGenEPKNS0_8DocumentE (libQt6QmlCompiler.so.6 + 0x94590)