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-rw-r--r--pym/_emerge/depgraph.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index dff0d9a79..cbf6737c7 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -4691,7 +4691,11 @@ class depgraph(object):
# an argument or a direct member of a set that has
# been specified as an argument (system or world).
if current_node not in self._dynamic_config._set_nodes:
- parent_nodes = mygraph.parent_nodes(current_node)
+ try:
+ parent_nodes = mygraph.parent_nodes(current_node)
+ except KeyError:
+ # This can happen sometimes for blockers.
+ pass
if parent_nodes:
child_nodes = set(mygraph.child_nodes(current_node))
selected_parent = None