Cannot package HTML5 because of a symbol multiply defined

Hey,
i tried to launch my project as HTML5 and i get the error:

LogPlayLevel: UnrealBuildTool: error: Linking globals named 'GInternalGameName': symbol multiply defined!
LogPlayLevel: UnrealBuildTool: Traceback (most recent call last):
LogPlayLevel: UnrealBuildTool:   File "D:\UE_4.16\Engine\Extras\ThirdPartyNotUE\emsdk\emscripten\1.37.9\emcc", line 13, in <module>
LogPlayLevel: UnrealBuildTool:     emcc.run()
LogPlayLevel: UnrealBuildTool:   File "D:\UE_4.16\Engine\Extras\ThirdPartyNotUE\emsdk\emscripten\1.37.9\emcc.py", line 1648, in run
LogPlayLevel: UnrealBuildTool:     final = shared.Building.llvm_opt(final, link_opts, DEFAULT_FINAL)
LogPlayLevel: UnrealBuildTool:   File "D:\UE_4.16\Engine\Extras\ThirdPartyNotUE\emsdk\emscripten\1.37.9\tools\shared.py", line 1838, in llvm_opt
LogPlayLevel: UnrealBuildTool:     assert os.path.exists(target), 'Failed to run llvm optimizations: ' + output
LogPlayLevel: UnrealBuildTool: AssertionError: Failed to run llvm optimizations:

So apparently the GInternalGameName is multiply defined. Had somebody of you the same error and can tell me where to look for those definitions. I added a plugin to my project which i need to use and i think that this should cause this error but i do not know where to look for this InternalGameName.