diff --git a/Models/ThemeConfig/Json/TagRenderingConfigJson.ts b/Models/ThemeConfig/Json/TagRenderingConfigJson.ts
index 6d35eff4ff..58e112f4c8 100644
--- a/Models/ThemeConfig/Json/TagRenderingConfigJson.ts
+++ b/Models/ThemeConfig/Json/TagRenderingConfigJson.ts
@@ -174,7 +174,7 @@ export interface TagRenderingConfigJson {
          * If chosen as answer, these tags will be applied as well onto the object.
          * Not compatible with multiAnswer
          */
-        addExtraTags: string[]
+        addExtraTags?: string[]
 
     }[]