diff --git a/addons/web_editor/static/src/js/wysiwyg/widgets/link_dialog.js b/addons/web_editor/static/src/js/wysiwyg/widgets/link_dialog.js
index 0accebd253a..4aecbe1c381 100644
--- a/addons/web_editor/static/src/js/wysiwyg/widgets/link_dialog.js
+++ b/addons/web_editor/static/src/js/wysiwyg/widgets/link_dialog.js
@@ -197,6 +197,10 @@ const LinkDialog = Dialog.extend({
      */
     save: function () {
         this.linkWidget.save();
+        if (!this.linkWidget.final_data) {
+            // Invalid form content: do not proceed with save.
+            return;
+        }
         this.final_data = this.linkWidget.final_data;
         return this._super(...arguments);
     },