Crash in `getBaseTypes`

[DorianListens]

Stack trace

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x100 pc=0x102c7d250]

goroutine 149880 [running]:
github.com/microsoft/typescript-go/internal/checker.(*Checker).getBaseTypes(0x140a7418008, 0x140be338fc0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:18574 +0x30
github.com/microsoft/typescript-go/internal/checker.(*Checker).isPropertyDeclaredInAncestorClass(0x140a7418008, 0x140964df238)
	github.com/microsoft/typescript-go/internal/checker/checker.go:11378 +0x70
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkPropertyNotUsedBeforeDeclaration(0x140a7418008, 0x140964df238, 0x140492bb0b8?, 0x140492bb0b8)
	github.com/microsoft/typescript-go/internal/checker/checker.go:11358 +0x2e4
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkPropertyAccessExpressionOrQualifiedName(0x140a7418008, 0x14031da8ec8, 0x140492c02a0, 0x141606bd490, 0x140492bb0b8, 0x0, 0x0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:11022 +0x794
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkPropertyAccessExpression(0x140a7418008, 0x14031da8ec8, 0x0, 0x0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:10912 +0x7c
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkExpressionWorker(0x140a7418008, 0x14031da8ec8, 0x1?)
	github.com/microsoft/typescript-go/internal/checker/checker.go:7537 +0x320
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkExpressionEx(0x140a7418008, 0x14031da8ec8, 0x0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:7334 +0x50
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkExpression(...)
	github.com/microsoft/typescript-go/internal/checker/checker.go:7327
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkNonNullExpression(0x140a7418008, 0x14031da8ec8)
	github.com/microsoft/typescript-go/internal/checker/checker.go:7179 +0x28
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkPropertyAccessExpression(0x140a7418008, 0x14048e4f8c0, 0x0, 0x0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:10912 +0x48
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkExpressionWorker(0x140a7418008, 0x14048e4f8c0, 0xb4a0f7c8?)
	github.com/microsoft/typescript-go/internal/checker/checker.go:7537 +0x320
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkExpressionEx(0x140a7418008, 0x14048e4f8c0, 0x0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:7334 +0x50
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkExpression(...)
	github.com/microsoft/typescript-go/internal/checker/checker.go:7327
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkNonNullExpression(0x140a7418008, 0x14048e4f8c0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:7179 +0x28
github.com/microsoft/typescript-go/internal/checker.(*Checker).getQuickTypeOfExpression(0x140a7418008, 0x14048e4fa20)
	github.com/microsoft/typescript-go/internal/checker/checker.go:7149 +0x104
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkDeclarationInitializer(0x140a7418008, 0x140492c0310, 0x0, 0x0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:16305 +0x40
github.com/microsoft/typescript-go/internal/checker.(*Checker).getTypeForVariableLikeDeclaration(0x140a7418008, 0x140492c0310, 0x1?, 0x0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:16255 +0x6e4
github.com/microsoft/typescript-go/internal/checker.(*Checker).getWidenedTypeForVariableLikeDeclaration(0x140a7418008, 0x140492c0310, 0x1)
	github.com/microsoft/typescript-go/internal/checker/checker.go:16158 +0x30
github.com/microsoft/typescript-go/internal/checker.(*Checker).getTypeOfVariableOrParameterOrPropertyWorker(0x140a7418008, 0x140964df238)
	github.com/microsoft/typescript-go/internal/checker/checker.go:16118 +0x24c
github.com/microsoft/typescript-go/internal/checker.(*Checker).getTypeOfVariableOrParameterOrProperty(0x140a7418008, 0x140964df238)
	github.com/microsoft/typescript-go/internal/checker/checker.go:16055 +0x50
github.com/microsoft/typescript-go/internal/checker.(*Checker).getTypeOfSymbol(0x140a7418008?, 0x140492c0310?)
	github.com/microsoft/typescript-go/internal/checker/checker.go:16015 +0xa8
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkVariableLikeDeclaration(0x140a7418008, 0x140492c0310)
	github.com/microsoft/typescript-go/internal/checker/checker.go:5703 +0x258
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkPropertyDeclaration(0x140a7418008, 0x140492c0310)
	github.com/microsoft/typescript-go/internal/checker/checker.go:2605 +0x60
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkSourceElementWorker(0x140a7418008, 0x140492c0310)
	github.com/microsoft/typescript-go/internal/checker/checker.go:2181 +0xb0
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkSourceElement(0x140a7418008, 0x102c21c44?)
	github.com/microsoft/typescript-go/internal/checker/checker.go:2150 +0x58
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkSourceElements(0x140a7418008, {0x140485d9a40, 0x7, 0x14012966958?})
	github.com/microsoft/typescript-go/internal/checker/checker.go:2140 +0x34
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkClassDeclaration(0x140a7418008, 0x14048e77dd0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:4162 +0x13c
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkSourceElementWorker(0x140a7418008, 0x14048e77dd0)
	github.com/microsoft/typescript-go/internal/checker/checker.go:2267 +0x2c0
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkSourceElement(0x140a7418008, 0x140a802d920?)
	github.com/microsoft/typescript-go/internal/checker/checker.go:2150 +0x58
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkSourceElements(0x140a7418008, {0x140485d9a78, 0x6, 0x1402de39090?})
	github.com/microsoft/typescript-go/internal/checker/checker.go:2140 +0x34
github.com/microsoft/typescript-go/internal/checker.(*Checker).checkSourceFile(0x140a7418008, {0x1034b9de0, 0x103b34880}, 0x140492b7208)
	github.com/microsoft/typescript-go/internal/checker/checker.go:2112 +0xf4
github.com/microsoft/typescript-go/internal/checker.(*Checker).CheckSourceFile(0x140a7418008, {0x1034b9de0, 0x103b34880}, 0x140492b7208)
	github.com/microsoft/typescript-go/internal/checker/checker.go:2101 +0x64
github.com/microsoft/typescript-go/internal/compiler.(*Program).getDiagnosticsHelper.(*Program).CheckSourceFiles.func1-range1(0x1405df83eb8?)
	github.com/microsoft/typescript-go/internal/compiler/program.go:378 +0x8c
github.com/microsoft/typescript-go/internal/compiler.(*checkerPool).Files.func1(0x140a79edcc0)
	github.com/microsoft/typescript-go/internal/compiler/checkerpool.go:119 +0x7c
github.com/microsoft/typescript-go/internal/compiler.(*Program).getDiagnosticsHelper.(*Program).CheckSourceFiles.func1(0x1405df83f78?, 0x140a7418008)
	github.com/microsoft/typescript-go/internal/compiler/program.go:376 +0xec
github.com/microsoft/typescript-go/internal/compiler.(*checkerPool).ForEachCheckerParallel.func1()
	github.com/microsoft/typescript-go/internal/compiler/checkerpool.go:108 +0xe0
github.com/microsoft/typescript-go/internal/core.(*parallelWorkGroup).Queue.func1()
	github.com/microsoft/typescript-go/internal/core/workgroup.go:40 +0x24
sync.(*WaitGroup).Go.func1()
	sync/waitgroup.go:239 +0x4c
created by sync.(*WaitGroup).Go in goroutine 1
	sync/waitgroup.go:237 +0x70

Steps to reproduce

This occurs in a large closed source project, which compiles cleanly with TypeScript 5.9.3. I'm not sure how to provide a minimal reproduction, as I'm not sure where in the codebase the issue is.