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-rw-r--r--Lib/traceback.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/traceback.py b/Lib/traceback.py
index 901b99476a..d6a010f415 100644
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -604,6 +604,8 @@ class TracebackException:
stype = self.exc_type.__qualname__
smod = self.exc_type.__module__
if smod not in ("__main__", "builtins"):
+ if not isinstance(smod, str):
+ smod = "<unknown>"
stype = smod + '.' + stype
if not issubclass(self.exc_type, SyntaxError):