diff --git a/web/app/components/base/prompt-editor/constants.tsx b/web/app/components/base/prompt-editor/constants.tsx
index 31fbc0abb..48e67a4ee 100644
--- a/web/app/components/base/prompt-editor/constants.tsx
+++ b/web/app/components/base/prompt-editor/constants.tsx
@@ -30,7 +30,7 @@ export const checkHasQueryBlock = (text: string) => {
 * {{#1711617514996.sys.query#}} => [sys, query]
 */
 export const getInputVars = (text: string): ValueSelector[] => {
-  if (!text)
+  if (!text || typeof text !== 'string')
     return []
 
   const allVars = text.match(/{{#([^#]*)#}}/g)