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-rw-r--r--pym/_emerge/__init__.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/pym/_emerge/__init__.py b/pym/_emerge/__init__.py
index bb9ae689d..996590da0 100644
--- a/pym/_emerge/__init__.py
+++ b/pym/_emerge/__init__.py
@@ -3890,6 +3890,9 @@ class BlockerCache(DictMixin):
self._modified.add(cpv)
def __iter__(self):
+ if self._cache_data is None:
+ # triggered by python-trace
+ return iter([])
return iter(self._cache_data["blockers"])
def __delitem__(self, cpv):