Try surrounding the call with beginEditing and endEditing on the text storage.
If it still happens, submit a feedback to Apple with the full crash log.
--
Gary L. Wade
http://www.garywade.com/
> On Mar 26, 2021, at 4:11 AM, Mark Allan via Cocoa-dev
> <cocoa-dev@lists.apple.com> wrote:
>
> Hi folks,
>
> Some users are reporting a crash that I can't reproduce, and in an attempt to
> gain additional diagnostics from a user, I wrapped the affected line in a
> try/catch block. For two users it resolve the crash, but for a third, it's
> still crashing at the same point!
>
> The crash occurs when a user attempts to open the "About" window from my
> app's main menu item. I'm not using the standard about panel as there's a few
> additional items I need to display, one of which is an NSTextView which I
> populate with the contents of an RTF file from within the app bundle.
>
> I've symbolicated the crash log to find it's happening when populating that
> TextView. The line in question now reads as follows:
>
> @try {
> [self.aboutBox.creditsTextView readRTFDFromFile:[[NSBundle mainBundle]
> pathForResource:@"Credits" ofType:@"rtf"]];
> } @catch (NSException *exception) {
> NSLog(@"Error loading the contents of the text file for the About Box.
> %@", exception);
> //Check we have a file at the expected path
> if([[NSFileManager defaultManager] fileExistsAtPath:[[NSBundle
> mainBundle] pathForResource:@"Credits" ofType:@"rtf"]]){
> NSLog(@"Yes. Found the RTF credits file");
> // check the attributes in case somehow there's no permission to
> read the file
> NSDictionary *fileAttributes =[[NSFileManager defaultManager]
> attributesOfItemAtPath:[[NSBundle mainBundle] pathForResource:@"Credits"
> ofType:@"rtf"] error:nil];
> NSLog(@"RTF file has following attributes %@", fileAttributes);
> }
> else {
> NSLog(@"Nope, file not found");
> }
> }
>
> This is the crash log from the newest build (with the try/catch around that
> line):
>
>> Performing @selector(showAboutBox:) from sender NSMenuItem 0x600000634540
>> *** Terminating app due to uncaught exception 'NSInvalidArgumentException',
>> reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
>> terminating with uncaught exception of type NSException
>> abort() called
>>
>> Application Specific Backtrace 1:
>> 0 CoreFoundation 0x00007fff206ea6af
>> __exceptionPreprocess + 242
>> 1 libobjc.A.dylib 0x00007fff204223c9
>> objc_exception_throw + 48
>> 2 CoreFoundation 0x00007fff2079ea9a -[__NSCFString
>> characterAtIndex:].cold.1 + 0
>> 3 CoreFoundation 0x00007fff2079c953 -[__NSArrayM
>> insertObject:atIndex:].cold.2 + 0
>> 4 CoreFoundation 0x00007fff20610421 -[__NSArrayM
>> insertObject:atIndex:] + 1135
>> 5 UIFoundation 0x00007fff23c223ab
>> __defaultTabStops_block_invoke + 161
>> 6 libdispatch.dylib 0x00007fff203cd7c7
>> _dispatch_client_callout + 8
>> 7 libdispatch.dylib 0x00007fff203ce96b
>> _dispatch_once_callout + 20
>> 8 UIFoundation 0x00007fff23c229d7
>> -[NSMutableParagraphStyle setTabStops:] + 199
>> 9 UIFoundation 0x00007fff23c3c697 -[NSRTFReader
>> defaultParagraphStyle] + 75
>> 10 UIFoundation 0x00007fff23c3c5be -[NSRTFReader
>> _mutableParagraphStyle] + 112
>> 11 UIFoundation 0x00007fff23c36113 controlClass +
>> 1757
>> 12 UIFoundation 0x00007fff23c356b4 -[NSRTFReader
>> attributedString] + 76
>> 13 UIFoundation 0x00007fff23c311a6
>> _NSReadAttributedStringFromURLOrData + 3213
>> 14 UIFoundation 0x00007fff23d46985
>> -[NSAttributedString(NSAttributedStringUIFoundationAdditions)
>> initWithURL:options:documentAttributes:error:] + 228
>> 15 AppKit 0x00007fff23677d9a -[NSTextView
>> readRTFDFromFile:] + 126
>> 16 MyAppHere 0x0000000105fa18a7 MyAppHere+
>> 227495
>> 17 AppKit 0x00007fff230af7fd
>> -[NSApplication(NSResponder) sendAction:to:from:] + 283
>> 18 AppKit 0x00007fff231b2611 -[NSMenuItem
>> _corePerformAction] + 413
>
>
> Any ideas what's going on? Other than the file not being found, why else
> might the object at line 3 in the backtrace be nil...and more interestingly,
> why is the exception not being caught?
>
> Thanks
> Mark
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