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A stack trace for the exception would be useful to help confirm a theory I have about the cause for this.  Or a full working code sample which can demonstrate the problem would allow us to investigate more easily.

Here's a stack trace, crash happens right when an Ad is refreshed (changes) it seems ...

2017-06-02 10:01:00.876 Street-Browser[800:7958] Google Maps SDK for iOS version: 2.3.30035.0
2017-06-02 10:02:19.670 Street-Browser[800:8077] *** Terminating app due to uncaught exception 'GMSThreadException', reason: 'The API method must be called from the main thread'
*** First throw call stack:
(
        0   CoreFoundation                      0x00000001142f1b0b __exceptionPreprocess + 171
        1   libobjc.A.dylib                     0x00000001136ba141 objc_exception_throw + 48
        2   CoreFoundation                      0x000000011435a625 +[NSException raise:format:] + 197
        3   Street-Browser                      0x000000010cdf3dae -[GMSPanoramaView camera] + 80
        4   Street-Browser                      0x000000010cdf535b -[GMSPanoramaView cameraDidChange:] + 42
        5   Street-Browser                      0x000000010cde7a79 -[GMSRocketIVGLView cameraDidUpdate:] + 100
        6   Street-Browser                      0x000000010cfec9ec -[GMSx_IVCameraLayer display] + 102
        7   QuartzCore                          0x00000001104eb31d _ZN2CA5Layer17display_if_neededEPNS_11TransactionE + 315
        8   QuartzCore                          0x00000001104eb3ab _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 35
        9   QuartzCore                          0x000000011047ae92 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294
        10  QuartzCore                          0x00000001104a7130 _ZN2CA11Transaction6commitEv + 468
        11  QuartzCore                          0x00000001104a7b37 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 115
        12  CoreFoundation                      0x0000000114297717 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
        13  CoreFoundation                      0x0000000114297687 __CFRunLoopDoObservers + 391
        14  CoreFoundation                      0x000000011427c720 __CFRunLoopRun + 1200
        15  CoreFoundation                      0x000000011427c016 CFRunLoopRunSpecific + 406
        16  WebCore                             0x000000011c663155 _ZL12RunWebThreadPv + 469
        17  libsystem_pthread.dylib             0x0000000114ca993b _pthread_body + 180
        18  libsystem_pthread.dylib             0x0000000114ca9887 _pthread_body + 0
        19  libsystem_pthread.dylib             0x0000000114ca908d thread_start + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) bt
* thread #17, name = 'WebThread', stop reason = signal SIGABRT
  * frame #0: 0x0000000114c74d42 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x0000000114cac457 libsystem_pthread.dylib`pthread_kill + 90
    frame #2: 0x0000000114a0688f libsystem_c.dylib`abort + 127
    frame #3: 0x00000001147f5ce5 libc++abi.dylib`abort_message + 245
    frame #4: 0x0000000114810cbd libc++abi.dylib`default_terminate_handler() + 265
    frame #5: 0x00000001136ba3c4 libobjc.A.dylib`_objc_terminate() + 103
    frame #6: 0x000000011480df29 libc++abi.dylib`std::__terminate(void (*)()) + 8
    frame #7: 0x000000011480dbbe libc++abi.dylib`__cxa_rethrow + 99
    frame #8: 0x00000001136ba2dc libobjc.A.dylib`objc_exception_rethrow + 40
    frame #9: 0x000000011427c096 CoreFoundation`CFRunLoopRunSpecific + 534
    frame #10: 0x000000011c663155 WebCore`RunWebThread(void*) + 469
    frame #11: 0x0000000114ca993b libsystem_pthread.dylib`_pthread_body + 180
    frame #12: 0x0000000114ca9887 libsystem_pthread.dylib`_pthread_start + 286
    frame #13: 0x0000000114ca908d libsystem_pthread.dylib`thread_start + 13
(lldb)

Update: It also happens when Panorama view isn't visible, just a mapView and a Google Ad.
It seems rotating the simulator screen a couple times is enough to trigger a crash.

Stack trace confirms my theory - can you confirm whether your second crash scenario has the same stack trace?

Yes, both scenarios look almost identical, the only difference is this line is missing without Panorama :
14  CoreFoundation                      0x000000010ae11720 __CFRunLoopRun + 1200

*** First throw call stack:
(
        0   CoreFoundation                      0x000000010ae86b0b __exceptionPreprocess + 171
        1   libobjc.A.dylib                     0x000000010a248141 objc_exception_throw + 48
        2   CoreFoundation                      0x000000010aeef625 +[NSException raise:format:] + 197
        3   Street-Browser                      0x0000000103a31dae -[GMSPanoramaView camera] + 80
        4   Street-Browser                      0x0000000103a3335b -[GMSPanoramaView cameraDidChange:] + 42
        5   Street-Browser                      0x0000000103a25a79 -[GMSRocketIVGLView cameraDidUpdate:] + 100
        6   Street-Browser                      0x0000000103c2a9ec -[GMSx_IVCameraLayer display] + 102
        7   QuartzCore                          0x000000010707431d _ZN2CA5Layer17display_if_neededEPNS_11TransactionE + 315
        8   QuartzCore                          0x00000001070743ab _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 35
        9   QuartzCore                          0x0000000107003e92 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294
        10  QuartzCore                          0x0000000107030130 _ZN2CA11Transaction6commitEv + 468
        11  QuartzCore                          0x0000000107030b37 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 115
        12  CoreFoundation                      0x000000010ae2c717 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
        13  CoreFoundation                      0x000000010ae2c687 __CFRunLoopDoObservers + 391
        14  CoreFoundation                      0x000000010ae11720 __CFRunLoopRun + 1200
        15  CoreFoundation                      0x000000010ae11016 CFRunLoopRunSpecific + 406
        16  WebCore                             0x00000001132a7155 _ZL12RunWebThreadPv + 469
        17  libsystem_pthread.dylib             0x000000010b85893b _pthread_body + 180
        18  libsystem_pthread.dylib             0x000000010b858887 _pthread_body + 0
        19  libsystem_pthread.dylib             0x000000010b85808d thread_start + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) bt
* thread #17, name = 'WebThread', stop reason = signal SIGABRT
  * frame #0: 0x000000010b823d42 libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x000000010b85b457 libsystem_pthread.dylib`pthread_kill + 90
    frame #2: 0x000000010b5b588f libsystem_c.dylib`abort + 127
    frame #3: 0x000000010b38ace5 libc++abi.dylib`abort_message + 245
    frame #4: 0x000000010b3a5cbd libc++abi.dylib`default_terminate_handler() + 265
    frame #5: 0x000000010a2483c4 libobjc.A.dylib`_objc_terminate() + 103
    frame #6: 0x000000010b3a2f29 libc++abi.dylib`std::__terminate(void (*)()) + 8
    frame #7: 0x000000010b3a2bbe libc++abi.dylib`__cxa_rethrow + 99
    frame #8: 0x000000010a2482dc libobjc.A.dylib`objc_exception_rethrow + 40
    frame #9: 0x000000010ae11096 CoreFoundation`CFRunLoopRunSpecific + 534
    frame #10: 0x00000001132a7155 WebCore`RunWebThread(void*) + 469
    frame #11: 0x000000010b85893b libsystem_pthread.dylib`_pthread_body + 180
    frame #12: 0x000000010b858887 libsystem_pthread.dylib`_pthread_start + 286
    frame #13: 0x000000010b85808d libsystem_pthread.dylib`thread_start + 13
(lldb)

Just wondering what your theory was?
Is there something I can do to fix in my code or wait for SDK update?

This issue is fixed in iOS Maps SDK 2.3.1.  Please give it a try.

For reference the underlying problem is possibly a bug in iOS - when you have a UIWebView in the view hierarchy at the same time as another view which uses a custom CALayer, the display callback for the custom CALayer sometimes spontaneously changes to be called on the web thread rather than the main thread.

Confirmed, the issue is now fixed.

Thank you.

Hi

Can anybody help

I am facing the below issue in iOS , how to resolve...?


Binary file ./Pods/Crashlytics/iOS/Crashlytics.framework/Crashlytics matches
./Pods/GoogleMaps/CHANGELOG:  - Fixed an issue resulting in a crash when UIWebView and GMSPanoramaView are
./Pods/GoogleMaps/CHANGELOG:  - Fixed a crash when using both a GMSMapView and a UIWebView or WKWebView in the view