Enigmatic INTERNAL SERVER ERROR

{
    "level": "error",
    "message": {
        "cause": {},
        "code": "INTERNAL_SERVER_ERROR",
        "name": "TRPCError"
    },
    "timestamp": "2023-03-23T12:14:12.710Z",
    "traceId": "...."
}

    trpcExpress.createExpressMiddleware({
      router: appRouter,
      createContext: createTRPCContext,
      onError: ({ path: errorPath, error, ctx }) => {
        const message = isDevelopment
          ? `❌❌❌ tRPC failed on ${errorPath ?? '<no-path>'}: ${
              error.message
            }`
          : error

        if (error.code === 'INTERNAL_SERVER_ERROR')
          ctx.req.logger.error(message)
        else ctx.req.logger.warn(message)
      },
    })