diff --git a/server/helpers/custom-validators/misc.ts b/server/helpers/custom-validators/misc.ts
index 2c4cd1b9f..937ae0632 100644
--- a/server/helpers/custom-validators/misc.ts
+++ b/server/helpers/custom-validators/misc.ts
@@ -119,7 +119,7 @@ function toCompleteUUID (value: string) {
     try {
       return shortToUUID(value)
     } catch {
-      return null
+      return ''
     }
   }