message: fix: sortChildren broke SSR
diff: @@ -24,6 +24,11 @@ type VueInstance = {
  // sort children instances by vnodes order
  export function sortChildren(children: VueInstance[], parent: VueInstance) {
  + // null on SSR
  + if (!parent._vnode) {
  + return;
  + }
  +
  const vnodes = flattenVNodes(parent._vnode.children!);
  children.sort((a, b) => vnodes.indexOf(a.$vnode) - vnodes.indexOf(b.$vnode));
  }
  