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Custom excepthooks can be installed in Python to be invoked when an exception is raised: https://docs.python.org/3/library/sys.html#sys.excepthook The excepthook is expected to take three arguments: the exception class, an exception instance, and a traceback object. The PythonScriptPlugin has some handling to detect when a custom excepthook is installed and make sure that it gets called, which it does from C++ using PyObject_CallFunctionObjArgs(). Depending on the exception though, it's possible that the FPyObjectPtrs that hold the exception instance and/or the traceback object could be invalid. When passed to PyObject_CallFunctionObjArgs(), their value then becomes nullptr, which is used to signal the end of the arguments list to the function and would therefore cause too few arguments to be passed to the excepthook. This would put the interpreter into a bad state where it would continue to attempt to call the excepthook with too few arguments, and no future commands would work. The easiest way to get into this bad state was to install a custom excepthook and then issue a Python command with invalid syntax. Doing so raises a SyntaxError with no traceback object, since the code could not actually be executed. To address this, we explicitly pass None for the exception instance and/or the traceback object when they are invalid to ensure that the excepthook always receives three arguments. #rb jamie.dale #preflight 62c5ba982a05d4f55b097757 [CL 20985039 by matt johnson in ue5-main branch]