check parentNode when calling insertBefore

When add new nodes, we may use insertBefore API to insert node before
its next sibling. But the sibling may not in the DOM tree at that
moment if it was in the missing node map.

src/replay/index.ts

@@ -271,9 +271,13 @@ export class Replayer {
             return;
           }
 
-          if (previous && previous.nextSibling) {
+          if (
+            previous &&
+            previous.nextSibling &&
+            previous.nextSibling.parentNode
+          ) {
             parent.insertBefore(target, previous.nextSibling);
-          } else if (next) {
+          } else if (next && next.parentNode) {
             parent.insertBefore(target, next);
           } else {
             parent.appendChild(target);