fix: the uncaught typeerror when el is null (#1308)

src/core/router/history/hash.js

@@ -39,7 +39,7 @@ export class HashHistory extends History {
     on('click', e => {
       const el = e.target.tagName === 'A' ? e.target : e.target.parentNode;
 
-      if (el.tagName === 'A' && !/_blank/.test(el.target)) {
+      if (el && el.tagName === 'A' && !/_blank/.test(el.target)) {
         navigating = true;
       }
     });