guard on

9 years ago · 7926f6ae83
1 changed files with 1 additions and 1 deletions
--- a/src/runtime/dom-backend/modules/events.js
+++ b/src/runtime/dom-backend/modules/events.js
@ -4,7 +4,7 @@ function updateDOMListeners (oldVnode, vnode) {
  if (!oldVnode.data.on && !vnode.data.on) {
    return
  }
-  const on = vnode.data.on
+  const on = vnode.data.on || {}
  const oldOn = oldVnode.data.on || {}
  updateListeners(on, oldOn, (event, handler, capture) => {
    vnode.elm.addEventListener(event, handler, capture)