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-rw-r--r--coverage/python.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/coverage/python.py b/coverage/python.py
index 5edfc54d..834bc332 100644
--- a/coverage/python.py
+++ b/coverage/python.py
@@ -131,7 +131,7 @@ def source_for_file(filename):
def source_for_morf(morf):
"""Get the source filename for the module-or-file `morf`."""
- if hasattr(morf, '__file__'):
+ if hasattr(morf, '__file__') and morf.__file__:
filename = morf.__file__
elif isinstance(morf, types.ModuleType):
# A module should have had .__file__, otherwise we can't use it.