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

Author: sy-records

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;
  }
  });