From de44a747f6194bb57b6ccbb59b269d2b6ce4e459 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sun, 31 Mar 2019 17:34:35 +0200
Subject: [PATCH] fix crash when checking an empty error message of an
 exception

---
 src/Gui/PythonConsole.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Gui/PythonConsole.cpp b/src/Gui/PythonConsole.cpp
index 5a95e64ab9..56b71255d4 100644
--- a/src/Gui/PythonConsole.cpp
+++ b/src/Gui/PythonConsole.cpp
@@ -323,7 +323,8 @@ void InteractiveInterpreter::runCode(PyCodeObject* code) const
         if (PyErr_Occurred()) {                   /* get latest python exception information */
             PyObject *errobj, *errdata, *errtraceback;
             PyErr_Fetch(&errobj, &errdata, &errtraceback);
-            if (PyDict_Check(errdata)) {
+            // the error message can be empty so errdata will be null
+            if (errdata && PyDict_Check(errdata)) {
                 PyObject* value = PyDict_GetItemString(errdata, "swhat");
                 if (value) {
                     Base::RuntimeError e;