It's trying to insert a NSTextTab * object.
On Fri, Mar 26, 2021 at 12:11 PM 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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