Added some additional checks for sys.std?? is None, see #1440
diff --git a/Modules/threadmodule.c b/Modules/threadmodule.c
index 62ea660..876d5e2 100644
--- a/Modules/threadmodule.c
+++ b/Modules/threadmodule.c
@@ -429,7 +429,7 @@
 			PySys_WriteStderr(
 				"Unhandled exception in thread started by ");
 			file = PySys_GetObject("stderr");
-			if (file)
+			if (file != NULL && file != Py_None)
 				PyFile_WriteObject(boot->func, file, 0);
 			else
 				PyObject_Print(boot->func, stderr, 0);