From ad63b730b3f8629adf5ed86b6bfaddb19c227c8f Mon Sep 17 00:00:00 2001
From: William Fu-Hinthorn <13333726+hinthornw@users.noreply.github.com>
Date: Mon, 24 Mar 2025 07:50:25 -0700
Subject: [PATCH] Log and continue for subgraph schema issues

---
 libs/langgraph/langgraph/graph/graph.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libs/langgraph/langgraph/graph/graph.py b/libs/langgraph/langgraph/graph/graph.py
index 074364867..f744d7101 100644
--- a/libs/langgraph/langgraph/graph/graph.py
+++ b/libs/langgraph/langgraph/graph/graph.py
@@ -522,9 +522,10 @@ class CompiledGraph(Pregel):
                 if len(subgraph.nodes) >= 1:
                     e, s = graph.extend(subgraph, prefix=key)
                     if e is None:
-                        raise ValueError(
+                        logger.warning(
                             f"Could not extend subgraph '{key}' due to missing entrypoint"
                         )
+                        continue
                     if s is not None:
                         start_nodes[key] = s
                     end_nodes[key] = e