I’m trying to add vuetify to an existing vue3 project but it triggers this error in some views:

TypeError: Cannot read properties of null (reading 'insertBefore')

Removing <v-app> and <v-main> from the main App.vue file is enough to make it disappear. Any idea why it happens or how to fix it? I didn’t do anything else apart from adding vuetify to the project, both following these istructions to add it to an existing project and also adding vuetify to my project the same way as yarn create vuetify (the build system is a bit different). In both cases I get the same error, which I don’t get in other apps.