diff --git a/packages/frontend-core/src/utils/jsonFormatter.ts b/packages/frontend-core/src/utils/jsonFormatter.ts
index de17426109..9f9af3a3c0 100644
--- a/packages/frontend-core/src/utils/jsonFormatter.ts
+++ b/packages/frontend-core/src/utils/jsonFormatter.ts
@@ -30,7 +30,7 @@ const entityMap = {
 
 function escapeHtml(html: string) {
   return String(html).replace(/[&<>"'`=]/g, function (s) {
-    return entityMap[s]
+    return entityMap[s as keyof typeof entityMap]
   })
 }