Crash running iOS/quickstarts/TranslateExample

[KennethLj]

After installing pods, running the Swift translate example project I almost immediately get the following crash, before any user interaction:

2020-06-06 13:58:06.597488+0200 TranslateExample[23887:3153991] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[3]'

Screenshot with stack trace and simulator:

[sheepmaster]

Thanks! Could you paste the full stack trace? In the screenshot it's getting cut off 🙂

[KennethLj]

Sure:

2020-06-06 15:15:55.644194+0200 TranslateExample[24780:3210858] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[3]' *** First throw call stack: ( 0 CoreFoundation 0x00007fff23e3cf0e __exceptionPreprocess + 350 1 libobjc.A.dylib 0x00007fff50ba89b2 objc_exception_throw + 48 2 CoreFoundation 0x00007fff23ecfa51 _CFThrowFormattedException + 194 3 CoreFoundation 0x00007fff23eda4a6 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:].cold.4 + 38 4 CoreFoundation 0x00007fff23e9b787 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 247 5 CoreFoundation 0x00007fff23e38e11 +[NSDictionary dictionaryWithObjects:forKeys:count:] + 49 6 TranslateExample 0x0000000108a50be3 -[MLKConfigFetchHTTPClient requestWithInstallationInfo:] + 615 7 TranslateExample 0x0000000108a5050c -[MLKConfigFetchHTTPClient fetchWithInstallationInfo:logEventContext:completionHandler:] + 152 8 TranslateExample 0x0000000108a55b12 __35-[MLKRemoteConfig fetchAndActivate]_block_invoke_2 + 197 9 TranslateExample 0x0000000108a53123 -[MLKFirebaseInstallationOperation start] + 548 10 Foundation 0x00007fff25924a20 __NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 17 11 Foundation 0x00007fff25924540 __NSOQSchedule_f + 182 12 libdispatch.dylib 0x000000010b6214dc _dispatch_block_async_invoke2 + 83 13 libdispatch.dylib 0x000000010b612e8e _dispatch_client_callout + 8 14 libdispatch.dylib 0x000000010b6157a3 _dispatch_continuation_pop + 552 15 libdispatch.dylib 0x000000010b614bbb _dispatch_async_redirect_invoke + 771 16 libdispatch.dylib 0x000000010b624399 _dispatch_root_queue_drain + 351 17 libdispatch.dylib 0x000000010b624ca6 _dispatch_worker_thread2 + 135 18 libsystem_pthread.dylib 0x00007fff51c089f7 _pthread_wqthread + 220 19 libsystem_pthread.dylib 0x00007fff51c07b77 start_wqthread + 15 ) libc++abi.dylib: terminating with uncaught exception of type NSException

[KennethLj]

Maybe better with an image since formatting wasn't so good:

[sheepmaster]

Thanks! Filed internally as b/158400839.

(FYI, if you use triple backticks ("```") instead of single backticks, the newlines are preserved:)

2020-06-06 15:15:55.644194+0200 TranslateExample[24780:3210858] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[3]'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff23e3cf0e __exceptionPreprocess + 350
	1   libobjc.A.dylib                     0x00007fff50ba89b2 objc_exception_throw + 48
	2   CoreFoundation                      0x00007fff23ecfa51 _CFThrowFormattedException + 194
	3   CoreFoundation                      0x00007fff23eda4a6 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:].cold.4 + 38
	4   CoreFoundation                      0x00007fff23e9b787 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 247
	5   CoreFoundation                      0x00007fff23e38e11 +[NSDictionary dictionaryWithObjects:forKeys:count:] + 49
	6   TranslateExample                    0x0000000108a50be3 -[MLKConfigFetchHTTPClient requestWithInstallationInfo:] + 615
	7   TranslateExample                    0x0000000108a5050c -[MLKConfigFetchHTTPClient fetchWithInstallationInfo:logEventContext:completionHandler:] + 152
	8   TranslateExample                    0x0000000108a55b12 __35-[MLKRemoteConfig fetchAndActivate]_block_invoke_2 + 197
	9   TranslateExample                    0x0000000108a53123 -[MLKFirebaseInstallationOperation start] + 548
	10  Foundation                          0x00007fff25924a20 __NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 17
	11  Foundation                          0x00007fff25924540 __NSOQSchedule_f + 182
	12  libdispatch.dylib                   0x000000010b6214dc _dispatch_block_async_invoke2 + 83
	13  libdispatch.dylib                   0x000000010b612e8e _dispatch_client_callout + 8
	14  libdispatch.dylib                   0x000000010b6157a3 _dispatch_continuation_pop + 552
	15  libdispatch.dylib                   0x000000010b614bbb _dispatch_async_redirect_invoke + 771
	16  libdispatch.dylib                   0x000000010b624399 _dispatch_root_queue_drain + 351
	17  libdispatch.dylib                   0x000000010b624ca6 _dispatch_worker_thread2 + 135
	18  libsystem_pthread.dylib             0x00007fff51c089f7 _pthread_wqthread + 220
	19  libsystem_pthread.dylib             0x00007fff51c07b77 start_wqthread + 15
)
libc++abi.dylib: terminating with uncaught exception of type NSException

[sheepmaster]

The underlying issue has been fixed in the ML Kit SDK; the fix will be included in the next release.

In the mean time, I think this issue occurs only when the current Locale doesn't have a region. I've only been able to reproduce that in the simulator when when the locale is explicitly set to "English" instead of the system locale – on an actual iPhone the locale always has a region ("US", "UK", …). You might be able to work around the crash by setting the simulator locale to the system locale.

[sheepmaster]

The fix for this has now been released in the latest version of ML Kit (0.61.0).