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-rw-r--r--coverage/html.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/coverage/html.py b/coverage/html.py
index ae1d041f..ede34a96 100644
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -441,7 +441,11 @@ class IncrementalChecker:
"""Check the global data that can affect incremental reporting."""
m = Hasher()
for d in data:
- m.update(d)
+ try:
+ m.update(d)
+ except:
+ print("Couldn't hash this: {d!r}".format(d=d))
+ raise
these_globals = m.hexdigest()
if self.globals != these_globals:
self.reset()