vue-query-builder TypeError: Cannot read property 'push' of undefined

[LoopLife]

a demo with vue-query-builder

• write vue-query-builder into el-drawer
• when click method of add,first time,it can be opened normally
• when i open it seond time,TypeError: Cannot read property 'push' of undefined

---

TypeError: Cannot read property 'push' of undefined
at VueComponent.addRule (VueQueryBuilder.common.js?9a97:4618)
at invokeWithErrorHandling (vue.runtime.esm.js?2b0e:1854)
at HTMLButtonElement.invoker (vue.runtime.esm.js?2b0e:2179)
at HTMLButtonElement.original._wrapper (vue.runtime.esm.js?2b0e:6917)

[joseph-sm]

I had same issue try setting the initial state for v-model eg.

query: {
    logicalOperator: 'all',
    children: [],
},

[sadortun]

Duplicate of #57