Unhandled exception when deleting a video sink

[GaryMakinMe]

Reported reproduction steps are:

• open the "2D HUB Sample"
• enter Play Mode
• select a Screen Share Source
• and quickly, repeatedly press "Start Screen Share"

The stack trace is:

0x00007FF8E67B923B (DolbyIO.Comms.Native) RemoveOnInvalidTokenExceptionHandler
0x00007FF8E67B92F9 (DolbyIO.Comms.Native) RemoveOnInvalidTokenExceptionHandler
0x00007FF8E67B9683 (DolbyIO.Comms.Native) RemoveOnInvalidTokenExceptionHandler
0x00007FF8E67B8843 (DolbyIO.Comms.Native) RemoveOnInvalidTokenExceptionHandler
0x000001DD938D95B7 (Mono JIT Code) (wrapper managed-to-native) DolbyIO.Comms.Native:DeleteVideoSink (intptr)
0x000001DD938D93EB (Mono JIT Code) DolbyIO.Comms.VideoFrameHandlerHandle:ReleaseHandle ()
0x000001DDB68A7A31 (Mono JIT Code) System.Runtime.InteropServices.SafeHandle:DangerousReleaseInternal (bool)
0x000001DCBF10547B (Mono JIT Code) System.Runtime.InteropServices.SafeHandle:InternalFinalize ()
0x000001DCB62F1513 (Mono JIT Code) System.Runtime.InteropServices.SafeHandle:Dispose (bool)
0x000001DCBF1052CC (Mono JIT Code) System.Runtime.InteropServices.SafeHandle:Finalize ()
0x000001DCB5BB6BBC (Mono JIT Code) (wrapper runtime-invoke) object:runtime_invoke_virtual_void__this__ (object,intptr,intptr,intptr)
0x00007FF8F3284335 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\gc.c:383] mono_gc_run_finalize 
0x00007FF8F32855F8 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\gc.c:943] finalize_domain_objects 
0x00007FF8F3285AAE (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\gc.c:1035] finalizer_thread 
0x00007FF8F3223E7B (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\threads.c:1268] start_wrapper_internal 
0x00007FF8F3224056 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\threads.c:1344] start_wrapper 
0x00007FF99A2326AD (KERNEL32) BaseThreadInitThunk
0x00007FF99B12AA68 (ntdll) RtlUserThreadStart