Just need to check if array

ee/app/assets/javascripts/roadmap/mixins/filtered_search_mixin.js

@@ -219,8 +219,7 @@ export default {
         });
       }
 
-      if (labelName?.length) {
-        if (Array.isArray(labelName)) {
+      if (labelName?.length && Array.isArray(labelName)) {
         filteredSearchValue.push(
           ...labelName.map((label) => ({
             type: 'label_name',
@@ -228,12 +227,6 @@ export default {
           })),
         );
       }
-      } else {
-        filteredSearchValue.push({
-          type: 'label_name',
-          value: { data: labelName, operator: OPERATOR_IS },
-        });
-      }
       if (notLabelName?.length) {
         filteredSearchValue.push(
           ...notLabelName.map((label) => ({