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It seems that you are already using the props appid’ and ‘regid’ where the props are not yet fully ready in your component itself. Thats why the vue returned a warning.
You could put a condition first before you execute your vfor to ensure that the props has already a value. like this one
Regs.vue
<template v-if="appid">
<tr v-bind:key="index" v-for="(reg, index) in regs">
<td class="masked">{{index+1}}</td>
<td>{{reg.name}}</td>
<td class="text-center">
<router-link class="bg-white" :to="{ name: 'ids', params: { appid: appid,
regid: reg.id}}">
<i class="fa fa-border fa-eye" title="View Identities"/>
</router-link>
</td>
</tr>
</template>
Ids.vue
<template v-if="appid && regid">
<tr v-bind:key="index" v-for="(id, index) in ids">
<td class="masked">{{index+1}}</td>
<td>{{id.name}}</td>
</tr>
</template>
Source:stackexchange.com