Fix ConcurrentModificationError in channel_impl.dart - #129
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Fix error : [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: type 'ConcurrentModificationError' is not a subtype of type 'Exception'
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Fix error :
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: type 'ConcurrentModificationError' is not a subtype of type 'Exception'.
When there are a lot of messages - periodically ConcurrentModificationError is displayed. This occurs due to concurrent reading and deletion from the Map.