diff --git a/backend/src/graphql/resolver/TransactionResolver.ts b/backend/src/graphql/resolver/TransactionResolver.ts
index 5c1fa04d3..0fb78747b 100644
--- a/backend/src/graphql/resolver/TransactionResolver.ts
+++ b/backend/src/graphql/resolver/TransactionResolver.ts
@@ -304,7 +304,7 @@ export class TransactionResolver {
     @Args() { identifier, amount, memo }: TransactionSendArgs,
     @Ctx() context: Context,
   ): Promise<boolean> {
-    logger.info(`sendCoins(email=${email}, amount=${amount}, memo=${memo})`)
+    logger.info(`sendCoins(identifier=${identifier}, amount=${amount}, memo=${memo})`)
     if (amount.lte(0)) {
       throw new LogError('Amount to send must be positive', amount)
     }
diff --git a/backend/src/graphql/resolver/UserResolver.ts b/backend/src/graphql/resolver/UserResolver.ts
index 71dc440de..5ed9e0c52 100644
--- a/backend/src/graphql/resolver/UserResolver.ts
+++ b/backend/src/graphql/resolver/UserResolver.ts
@@ -823,10 +823,9 @@ export class UserResolver {
   }
 
   @Authorized([RIGHTS.USER])
-  @Query(() => User, { nullable: true })
-  async user(@Arg('identifier') identifier: string): Promise<User | null> {
-    const user = await findUserByIdentifier(identifier)
-    return user ? new User(user) : null
+  @Query(() => User)
+  async user(@Arg('identifier') identifier: string): Promise<User> {
+    return new User(await findUserByIdentifier(identifier))
   }
 }
 
diff --git a/backend/src/graphql/resolver/util/findUserByIdentifier.ts b/backend/src/graphql/resolver/util/findUserByIdentifier.ts
index e5907552e..1bb6b3b95 100644
--- a/backend/src/graphql/resolver/util/findUserByIdentifier.ts
+++ b/backend/src/graphql/resolver/util/findUserByIdentifier.ts
@@ -3,7 +3,7 @@ import { UserContact as DbUserContact } from '@entity/UserContact'
 import LogError from '@/server/LogError'
 import { validate, version } from 'uuid'
 
-export const findUserByIdentifier = async (identifier: string): Promise<DbUser | null> => {
+export const findUserByIdentifier = async (identifier: string): Promise<DbUser> => {
   let user: DbUser | undefined
   if (validate(identifier) && version(identifier) === 4) {
     user = await DbUser.findOne({ where: { gradidoID: identifier }, relations: ['emailContact'] })