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-rw-r--r--networkx/algorithms/shortest_paths/weighted.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/networkx/algorithms/shortest_paths/weighted.py b/networkx/algorithms/shortest_paths/weighted.py
index f5ff3ee1..a717b671 100644
--- a/networkx/algorithms/shortest_paths/weighted.py
+++ b/networkx/algorithms/shortest_paths/weighted.py
@@ -2138,6 +2138,7 @@ def negative_edge_cycle(G, weight="weight", heuristic=True):
"""
if G.size() == 0:
return False
+
# find unused node to use temporarily
newnode = -1
while newnode in G: