Error in v-on handler (Promise/async): "TypeError: Cannot convert undefined or null to object"

[NatNiM]

Describe the bug
vue.runtime.esm.js?c320:3020 TypeError: Cannot convert undefined or null to object
at Function.keys ()
at mergeConfig (vue-dadata.esm.js?4d05:3845:1)
at Axios.request (vue-dadata.esm.js?4d05:3964:1)
at Axios. [as post] (vue-dadata.esm.js?4d05:4065:1)
at Function.wrap [as post] (vue-dadata.esm.js?4d05:428:1)
at getSuggestions (vue-dadata.esm.js?4d05:4307:1)
at VueComponent.fetchSuggestions (vue-dadata.esm.js?4d05:4507:1)
at VueComponent.onInputChange (vue-dadata.esm.js?4d05:4439:1)
at invokeWithErrorHandling (vue.runtime.esm.js?c320:2988:1)
at HTMLInputElement.invoker (vue.runtime.esm.js?c320:1781:1)

To Reproduce

<VueDadata
      placeholder="Start typing an address"
        classes="address-component"
        :token="token"
        :onChange="sendAddress"
        v-model="query"
        :locationOptions="locations"/>

data(){
    const query = '';
    return {
        query,
        token: "kvivrijrieurbnunuybite",
        locations: {
          language: "ru",
          locations: [{country: "*"}]
        }
      }
  },
  methods: {
    sendAddress: function(suggestion) {
      const data = suggestion.data;
      this.$emit("show:address", data);
    },
  }

Desktop (please complete the following information):

• OS: Windows10
• Browser: Opera

Additional context
Error when entering address (dadata version 2)