TypeError: Cannot set property '_isHover' of null

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报过好多次这种错误

[Vue warn]: Error in callback for watcher "data": "TypeError: Cannot set property '_isHover' of null"

found in

---> <Table>

TypeError: Cannot set property '_isHover' of null
    at VueComponent.eval (iview.js?f489:22929)
    at Array.forEach (<anonymous>)
    at VueComponent.makeObjData (iview.js?f489:22925)
    at VueComponent.handler (iview.js?f489:23076)
    at Watcher.run (vue.runtime.esm.js?3a00:3345)
    at flushSchedulerQueue (vue.runtime.esm.js?3a00:3087)
    at Array.eval (vue.runtime.esm.js?3a00:1916)
    at flushCallbacks (vue.runtime.esm.js?3a00:1835)

从几次调数据的情况看，是赋值了一个undefined