diff --git a/src/htmx.js b/src/htmx.js
index 52f1ae3e..5e9dda0c 100644
--- a/src/htmx.js
+++ b/src/htmx.js
@@ -533,6 +533,7 @@ return (function () {
                     }
                 }
                 while (elt = elt && parentElt(elt));
+                return null;
             }
         }