Fixed shadow dom parent issue (#1986)

packages/trap/src/index.js

@@ -39,7 +39,7 @@ export default function (Alpine) {
 }
 
 function crawlSiblingsUp(el, callback) {
-    if (el.isSameNode(document.body)) return
+    if (el.isSameNode(document.body) || ! el.parentNode) return
 
     Array.from(el.parentNode.children).forEach(sibling => {
         if (! sibling.isSameNode(el)) callback(sibling)