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-rw-r--r--libs/subcircuit/subcircuit.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/libs/subcircuit/subcircuit.cc b/libs/subcircuit/subcircuit.cc
index 782040be..2c6f3d82 100644
--- a/libs/subcircuit/subcircuit.cc
+++ b/libs/subcircuit/subcircuit.cc
@@ -1274,6 +1274,10 @@ class SubCircuit::SolverWorker
const std::string &graphId = graph_it.first;
const auto &graph = graph_it.second.graph;
int node2 = adj_it.first;
+
+ if (node1 == node2)
+ continue;
+
NodeSet pair(graphId, node1, node2);
if (usedPairs.count(pair) > 0)