Update app.py

app.py

@@ -378,6 +378,7 @@ def main():
             st.session_state.db
         )
     
+    # Initialize conversation state
     # Initialize conversation state
     if "conversation" not in st.session_state:
         st.session_state.conversation = {
@@ -389,7 +390,7 @@ def main():
             "execution_results": {},
             "confidence_scores": {},
             "status": "planning",
-            "current_agent": "understanding_agent"
+            "current_agent": ["understanding_agent"]  # Explicit list initialization
         }
     
     # Initialize agent state for new runs
@@ -403,7 +404,7 @@ def main():
             execution_results={},
             confidence_scores={},
             status="planning",
-            current_agent="understanding_agent"
+            current_agent=["understanding_agent"]  # Explicit list initialization
         )
     
     # Main content area