diff --git a/web_advanced_search/static/src/js/web_advanced_search.js b/web_advanced_search/static/src/js/web_advanced_search.js
index 72b0e8c51..2cb4f1ec2 100644
--- a/web_advanced_search/static/src/js/web_advanced_search.js
+++ b/web_advanced_search/static/src/js/web_advanced_search.js
@@ -76,6 +76,23 @@ odoo.define("web_advanced_search", function(require) {
             "click .o_add_advanced_search": "advanced_search_open",
         }),
 
+        /**
+         * Handle dropdown hidden event to prevent the menu from closing when using a
+         * relational field
+         *
+         * @override
+         */
+        start: function() {
+            this._super.apply(this, arguments);
+            this.$el.on("hide.bs.dropdown", function() {
+                var $modal = $(".o_technical_modal.show");
+                return !(
+                    ($modal.length && !$modal.has($(this)).length) ||
+                    $("body.oe_wait").length
+                );
+            });
+        },
+
         /**
          * @override
          */