I have an old App which my company still provides legacy support for.
There's a strange error that's occurring for some of our clients but not on our end. It apparently happens when the user picks some image from ImagePickerController.
The exception says:
Fatal Exception: NSInvalidArgumentException
-[PSImageViewController imagePickerController:didFinishPickingMediaWithInfo:] -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]
The stack trace is:
Fatal Exception: NSInvalidArgumentException
0 CoreFoundation 0x2017b7ea0 __exceptionPreprocess
1 libobjc.A.dylib 0x200989a40 objc_exception_throw
2 CoreFoundation 0x20172f470 _CFArgv
3 CoreFoundation 0x2016a85f4 -[__NSPlaceholderArray initWithObjects:count:]
4 CoreFoundation 0x2017b3600 __createArray
5 CoreFoundation 0x2016b0584 +[NSArray arrayWithObject:]
6 MyAppName 0x102191378 -[PSImageViewController imagePickerController:didFinishPickingMediaWithInfo:] (PSImageViewController.m:221)
7 UIKitCore 0x22e30e30c -[UIImagePickerController _imagePickerDidCompleteWithInfo:]
8 PhotoLibrary 0x214add528 (Missing)
9 CameraUI 0x21f38c728 -[CAMImagePickerCameraViewController _handleCapturedImagePickerPhotoWithCropOverlayOutput:]
10 AssetsLibraryServices 0x20f173814 __pl_dispatch_sync_block_invoke
11 libdispatch.dylib 0x2011f2484 _dispatch_client_callout
12 libdispatch.dylib 0x20119f6b0 _dispatch_async_and_wait_invoke
13 libdispatch.dylib 0x2011f2484 _dispatch_client_callout
14 libdispatch.dylib 0x20119e9b4 _dispatch_main_queue_callback_4CF$VARIANT$mp
15 CoreFoundation 0x201747dd0 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__
16 CoreFoundation 0x201742c98 __CFRunLoopRun
17 CoreFoundation 0x2017421cc CFRunLoopRunSpecific
18 GraphicsServices 0x2039b9584 GSEventRunModal
19 UIKitCore 0x22e985054 UIApplicationMain
20 MyAppName 0x1020d60fc main (main.m:17)
21 libdyld.dylib 0x201202bb4 start
My code for ImagePickerController's delegate is:
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
if([info objectForKey:UIImagePickerControllerEditedImage])
{
self.image = [info valueForKey:UIImagePickerControllerEditedImage];
}
else
{
self.image = [info valueForKey:UIImagePickerControllerOriginalImage];
}
[self.imgProperty setImage:self.image];
[[PSDataPersistenceManager sharedManager] updateModificationStatusOfAppointments:[NSArray arrayWithObject:self.propertyObj.propertyToAppointment] toModificationStatus:[NSNumber numberWithBool:YES]];
[self dismissViewControllerAnimated:YES completion:nil];
}
As you can see, I am not actually doing anything here that might cause that exception. The code which opens the imagePicker is:
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
CLS_LOG(@"Clicked Index %d",buttonIndex);
if (actionSheet.tag == 1)
{
if (buttonIndex != actionSheet.cancelButtonIndex)
{
if (buttonIndex == actionSheet.firstOtherButtonIndex)
{
[self showCameraOfSourceType:UIImagePickerControllerSourceTypeCamera];
}
else if (buttonIndex == actionSheet.firstOtherButtonIndex + 1)
{
[self showCameraOfSourceType:UIImagePickerControllerSourceTypePhotoLibrary]; return;
}
}
}
}
The specific line in the trace PhotoLibrary 0x214add528 (Missing) is very curious. I think somehow the user doesn't have a PhotoLibrary or that somehow a wrong media source is chosen for Imagepicker. Or is it
[[PSDataPersistenceManager sharedManager] updateModificationStatusOfAppointments:[NSArray arrayWithObject:self.propertyObj.propertyToAppointment] toModificationStatus:[NSNumber numberWithBool:YES]];
which is causing the issue with self.propertyObj.propertyToAppointment somehow being null? I have checked, it can't be null. Or there would be more crashes on this screen. It is always valid in my test-runs.
How can I fix this crash?
The error is from line 221. You create an array with:
[NSArray arrayWithObject:self.propertyObj.propertyToAppointment]
The error is telling you that self.propertyObj.propertyToAppointment is nil.