Random "Controller cannot be nil" crash
Random "Controller cannot be nil" crash
- Subject: Random "Controller cannot be nil" crash
- From: Jean-Nicolas Jolivet <email@hidden>
- Date: Tue, 30 Mar 2010 14:31:23 -0400
I'm having a very frustrating issue that I can't seem to be able to pinpoint...
When I run my app, I randomly get a crash on startup with the following message(s) in the console:
==============================================================================================
2010-03-30 13:57:52.599 MyApp[6292:a0f] An uncaught exception was raised
2010-03-30 13:57:52.599 MyApp[6292:a0f] Controller cannot be nil
2010-03-30 13:57:52.601 MyApp[6292:a0f] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Controller cannot be nil'
*** Call stack at first throw:
(
0 CoreFoundation 0x989dc40a __raiseError + 410
1 libobjc.A.dylib 0x91bbe509 objc_exception_throw + 56
2 CoreFoundation 0x989dc138 +[NSException raise:format:arguments:] + 136
3 CoreFoundation 0x989dc0aa +[NSException raise:format:] + 58
4 AppKit 0x977e771b -[NSBinder addBinding:toController:withKeyPath:valueTransformer:options:] + 252
5 AppKit 0x977e00f2 -[NSObject(NSKeyValueBindingCreation) bind:toObject:withKeyPath:options:] + 703
6 AppKit 0x9788c067 -[NSNibBindingConnector establishConnection] + 156
7 AppKit 0x977bb33b -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1249
8 AppKit 0x977b9450 loadNib + 257
9 AppKit 0x977b8848 +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 228
10 AppKit 0x977b8759 +[NSBundle(NSNibLoading) loadNibFile:externalNameTable:withZone:] + 158
11 AppKit 0x977b86a4 +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 383
12 AppKit 0x977b54a9 NSApplicationMain + 434
13 MyApp 0x00002694 main + 36
14 MyApp 0x00002665 start + 53
)
sharedlibrary apply-load-rules all
kill
quit
==============================================================================================
Judging by the trace, I'm thinking it might have something to do with bindings? It appears to be really random... I'd say 1 times out of 3 my app starts normally, the other 2 attempts, I get this error...
Most of my controllers (that have bindings anyway) are singletons, but I tried changing that (i.e. to have my sharedController method return "(sharedController = [[[self class] alloc] init]);" instead)... the bug still occur...
I'm out of ideas... I guess the problem could be in my nib but I also tried to perform a "diff" on my nib file (when the app actually runs and when it crashes), but the nib is exactly the same in both occasions... I can post my singleton code if it would help but it's a singleton template that I use all the time without any problems
If anyone has a clue as to what could be happening, it would be really appreciated as I really have no idea what to try next...
Jean-Nicolas Jolivet
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