--- /home/jeff/workspace/python/Python-3.5.0a3-original/Python/pylifecycle.c
+++ /home/jeff/workspace/python/Python-3.5.0a3/Python/pylifecycle.c
@@ -1299,8 +1299,12 @@
         return;
 
 display_stack:
+#ifdef WITH_THREADS    
     /* PyGILState_GetThisThreadState() works even if the GIL was released */
     tstate = PyGILState_GetThisThreadState();
+#else
+    tstate = NULL;
+#endif
     if (tstate == NULL) {
         /* _Py_DumpTracebackThreads() requires the thread state to display
          * frames */