diff --git a/client/src/components/Chat/Messages/Content/ToolCall.tsx b/client/src/components/Chat/Messages/Content/ToolCall.tsx
index d5c7456da0..64b3210981 100644
--- a/client/src/components/Chat/Messages/Content/ToolCall.tsx
+++ b/client/src/components/Chat/Messages/Content/ToolCall.tsx
@@ -33,7 +33,8 @@ export default function ToolCall({
 
   const [function_name, _domain] = name.split(actionDelimiter) as [string, string | undefined];
   const domain = _domain?.replaceAll(actionDomainSeparator, '.') ?? null;
-  const error = output?.toLowerCase()?.includes('error processing tool');
+  const error =
+    typeof output === 'string' && output.toLowerCase().includes('error processing tool');
 
   const args = useMemo(() => {
     if (typeof _args === 'string') {