Notifications to users who uninstalled the app triggers internal error

[tinaroh]

https://console.cloud.google.com/errors/COyjt4TNkMDy1wE?service=default&version&time=P1D&project=raha-5395e

An error occurred notifying member with id X about unminted Raha. { Error: Internal error encountered. at FirebaseMessagingError.FirebaseError [as constructor] (/app/node_modules/firebase-admin/lib/utils/error.js:39:28) at FirebaseMessagingError.PrefixedFirebaseError [as constructor] (/app/node_modules/firebase-admin/lib/utils/error.js:85:28) at new FirebaseMessagingError (/app/node_modules/firebase-admin/lib/utils/error.js:241:16) at Function.FirebaseMessagingError.fromServerError (/app/node_modules/firebase-admin/lib/utils/error.js:271:16) at /app/node_modules/firebase-admin/lib/messaging/messaging-api-request.js:149:50 at process._tickCallback (internal/process/next_tick.js:68:7)