system level exception when passing a char[] to Teststand 2012 c++ dll

I want to pass a char[] from teststand to c++ dll. When I send an emtpty string from teststand I get a system level exception.

Here my prototype in Teststand

Here the prototype in C++

extern "C" int DllExport GAP_TerminateLinkRequest(char reason, char connectionName[CONNECTION_NAME_MAX] = { 0 });