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-rw-r--r--coverage/control.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/coverage/control.py b/coverage/control.py
index 369204d6..59d237ea 100644
--- a/coverage/control.py
+++ b/coverage/control.py
@@ -163,6 +163,10 @@ class coverage(object):
# Only _harvest_data once per measurement cycle.
self._harvested = False
+ # When tearing down the coverage object, modules can become None.
+ # Saving the modules as object attributes avoids problems, but it is
+ # quite ad-hoc which modules need to be saved and which references
+ # need to use the object attributes.
self.socket = socket
self.os = os
self.random = random