diff --git a/backend/workflow_executor.py b/backend/workflow_executor.py
index 8809032..e5a7152 100644
--- a/backend/workflow_executor.py
+++ b/backend/workflow_executor.py
@@ -594,6 +594,9 @@ def execute_end_node(
             # AUTO mode: Concatenate all analysis_core values
             logger.debug(f"End node {node.id}: Using AUTO output mode")
 
+            # Get graph from context for node label lookup
+            graph = context.get("graph")
+
             combined_analysis = []
             for node_id, node_state in context.get("node_results", {}).items():
                 if node_state.status == NodeStatus.EXECUTED and node_state.analysis_core: