diff --git a/web_advanced_search/static/src/js/legacy/CustomFilterItem.esm.js b/web_advanced_search/static/src/js/legacy/CustomFilterItem.esm.js
index d26913bb1..8430ee63f 100644
--- a/web_advanced_search/static/src/js/legacy/CustomFilterItem.esm.js
+++ b/web_advanced_search/static/src/js/legacy/CustomFilterItem.esm.js
@@ -76,8 +76,10 @@ patch(CustomFilterItem.prototype, "web_advanced_search.legacy.CustomFilterItem",
      * @param {OwlEvent} ev
      */
     onRelationalChanged(condition, ev) {
-        condition.value = ev.detail.id;
-        condition.displayedValue = ev.detail.display_name;
+        if (ev.detail) {
+            condition.value = ev.detail.id;
+            condition.displayedValue = ev.detail.display_name;
+        }
     },
 });
 
diff --git a/web_advanced_search/static/src/js/owl/CustomFilterItem.esm.js b/web_advanced_search/static/src/js/owl/CustomFilterItem.esm.js
index f4d4c6468..4af797ed2 100644
--- a/web_advanced_search/static/src/js/owl/CustomFilterItem.esm.js
+++ b/web_advanced_search/static/src/js/owl/CustomFilterItem.esm.js
@@ -72,8 +72,10 @@ patch(CustomFilterItem.prototype, "web_advanced_search.CustomFilterItem", {
      * @param {OwlEvent} ev
      */
     onRelationalChanged(condition, ev) {
-        condition.value = ev.detail.id;
-        condition.displayedValue = ev.detail.display_name;
+        if (ev.detail) {
+            condition.value = ev.detail.id;
+            condition.displayedValue = ev.detail.display_name;
+        }
     },
 });