diff --git a/letta/server/rest_api/app.py b/letta/server/rest_api/app.py
index 3cda0a64..0db9ac85 100644
--- a/letta/server/rest_api/app.py
+++ b/letta/server/rest_api/app.py
@@ -254,6 +254,7 @@ def create_application() -> "FastAPI":
     app.add_exception_handler(LettaToolCreateError, _error_handler_400)
     app.add_exception_handler(LettaToolNameConflictError, _error_handler_400)
     app.add_exception_handler(AgentFileImportError, _error_handler_400)
+    app.add_exception_handler(ValueError, _error_handler_400)
 
     # 404 Not Found errors
     app.add_exception_handler(NoResultFound, _error_handler_404)