diff --git a/wagtail/wagtailadmin/static_src/wagtailadmin/js/hallo-plugins/hallo-wagtaillink.js b/wagtail/wagtailadmin/static_src/wagtailadmin/js/hallo-plugins/hallo-wagtaillink.js
index dc2fbfd07..46913dbfa 100644
--- a/wagtail/wagtailadmin/static_src/wagtailadmin/js/hallo-plugins/hallo-wagtaillink.js
+++ b/wagtail/wagtailadmin/static_src/wagtailadmin/js/hallo-plugins/hallo-wagtaillink.js
@@ -56,7 +56,7 @@
                             url = window.chooserUrls.emailLinkChooser;
                             href = href.replace('mailto:', '');
                             urlParams['link_url'] = href;
-                        } else if (linkType == '') {
+                        } else if (!linkType) {  /* external link */
                             url = window.chooserUrls.externalLinkChooser;
                             urlParams['link_url'] = href;
                         }