diff --git a/mcp/tools/graph.py b/mcp/tools/graph.py
index 41a56abb..5508025b 100644
--- a/mcp/tools/graph.py
+++ b/mcp/tools/graph.py
@@ -92,7 +92,7 @@ def handle_get_graph_summary(args: dict) -> dict:  # noqa: ARG001
             try:
                 edge_count = graph.edge_count()
             except Exception:
-                pass
+                log.exception("graph.edge_count failed; defaulting edge_count to 0")
         return {
             "node_count": len(all_nodes),
             "edge_count": edge_count,