At this line of code (SketchTextSelectionManager.swift:449), sometimes there will be crashes based on crashlytics reports.
let selection = pdfPage.selectionForWord(at: location)
This is directly calling into PDFKit's PDFPage#selection method: https://developer.apple.com/documentation/pdfkit/pdfpage/selectionforword(at:)
Attached the full stacktrace:
Crashed: com.apple.root.user-initiated-qos.cooperative
0 CoreGraphics 0x30c968 PageLayout::getWordRange(unsigned long, long) const + 908
1 CoreGraphics 0x30bbc0 PageLayout::getTextRangeIndex(CGPoint, CGPDFSelectionType, SelectionPrecision) const + 2292
2 CoreGraphics 0x44a53c CGPDFSelectionCreateBetweenPointsWithOptions + 384
3 PDFKit 0x8d5f8 -[PDFPage selectionFromPoint:toPoint:type:] + 168
4 PDFKit 0x92040 -[PDFPage _rvItemAtPoint:] + 64
5 PDFKit 0x91f4c -[PDFPage rvItemAtPoint:] + 84
6 PDFKit 0x8caa8 -[PDFPage selectionForWordAtPoint:] + 40
7 MyApp 0x8420e0 closure #1 in SketchTextSelectionManager.startNewTextSelection(pageId:location:) + 449 (SketchTextSelectionManager.swift:449)
8 MyApp 0x841a70 SketchTextSelectionManager.startNewTextSelection(pageId:location:) + 205 (CurrentNoteManager.swift:205)
9 libswift_Concurrency.dylib 0x61104 swift::runJobInEstablishedExecutorContext(swift::Job*) + 252
10 libswift_Concurrency.dylib 0x63a28 (anonymous namespace)::ProcessOutOfLineJob::process(swift::Job*) + 480
11 libswift_Concurrency.dylib 0x611c4 swift::runJobInEstablishedExecutorContext(swift::Job*) + 444
12 libswift_Concurrency.dylib 0x62514 swift_job_runImpl(swift::Job*, swift::SerialExecutorRef) + 144
13 libdispatch.dylib 0x15d8c _dispatch_root_queue_drain + 392
14 libdispatch.dylib 0x16590 _dispatch_worker_thread2 + 156
15 libsystem_pthread.dylib 0x4c40 _pthread_wqthread + 228
16 libsystem_pthread.dylib 0x1488 start_wqthread + 8
```