fix(watch): check if __ob__ has value before addSub (#477)

vuejs · Aug 15, 2020 · d8cd30d · d8cd30d
1 parent 01ca6ff
commit d8cd30d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/apis/watch.ts b/src/apis/watch.ts
@@ -321,7 +321,7 @@ function createWatcher(
 
   // if the return value is reactive and deep:true
   // watch for changes, this might happen when new key is added
-  if (isReactive(watcher.value) && deep) {
+  if (isReactive(watcher.value) && watcher.value.__ob__?.dep && deep) {
     watcher.value.__ob__.dep.addSub({
       update() {
         // this will force the source to be revaluated and the callback