element-ui.common.js?ccbf:11878 Uncaught DOMException: Failed to execute '
setEnd' on 'Range': There is no child at offset 1.
    at VueComponent.handleCellMouseEnter (webpack-internal:///./node_mod
ules/element-ui/lib/element-ui.common.js:11878:13)
    at mouseenter (webpack-internal:///./node_modules/element-ui/lib/element-ui.common.js:11609:40)
    at invoker (webpack-internal:///./node_modules/vue/dist/vue.esm
.js:2026:18)
    at HTMLTableCellElement.fn._withTask.fn._withTask (webpack-internal:///./node_modules/vue/dist/vue.esm.js
:1825:18)

table绑定的字段有null

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