diff --git a/pkg/services/login/loginservice/loginservice.go b/pkg/services/login/loginservice/loginservice.go
index d869a489ffd..8610a85a76d 100644
--- a/pkg/services/login/loginservice/loginservice.go
+++ b/pkg/services/login/loginservice/loginservice.go
@@ -38,6 +38,11 @@ func (ls *Implementation) CreateUser(cmd models.CreateUserCommand) (*models.User
 
 // UpsertUser updates an existing user, or if it doesn't exist, inserts a new one.
 func (ls *Implementation) UpsertUser(ctx context.Context, cmd *models.UpsertUserCommand) error {
+	var logger log.Logger = logger
+	if cmd.ReqContext != nil && cmd.ReqContext.Logger != nil {
+		logger = cmd.ReqContext.Logger
+	}
+
 	extUser := cmd.ExternalUser
 
 	user, err := ls.AuthInfoService.LookupAndUpdate(ctx, &models.GetUserByAuthInfoQuery{
@@ -50,13 +55,13 @@ func (ls *Implementation) UpsertUser(ctx context.Context, cmd *models.UpsertUser
 			return err
 		}
 		if !cmd.SignupAllowed {
-			cmd.ReqContext.Logger.Warn("Not allowing login, user not found in internal user database and allow signup = false", "authmode", extUser.AuthModule)
+			logger.Warn("Not allowing login, user not found in internal user database and allow signup = false", "authmode", extUser.AuthModule)
 			return login.ErrSignupNotAllowed
 		}
 
 		limitReached, err := ls.QuotaService.QuotaReached(cmd.ReqContext, "user")
 		if err != nil {
-			cmd.ReqContext.Logger.Warn("Error getting user quota.", "error", err)
+			logger.Warn("Error getting user quota.", "error", err)
 			return login.ErrGettingUserQuota
 		}
 		if limitReached {
diff --git a/pkg/services/login/loginservice/loginservice_test.go b/pkg/services/login/loginservice/loginservice_test.go
index ff86322a958..d5ddbe2e61b 100644
--- a/pkg/services/login/loginservice/loginservice_test.go
+++ b/pkg/services/login/loginservice/loginservice_test.go
@@ -6,14 +6,17 @@ import (
 	"errors"
 	"testing"
 
+	"github.com/grafana/grafana/pkg/services/login"
+
 	"github.com/go-kit/log"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
 	"github.com/grafana/grafana/pkg/infra/log/level"
 	"github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/services/login/logintest"
 	"github.com/grafana/grafana/pkg/services/quota"
 	"github.com/grafana/grafana/pkg/services/sqlstore/mockstore"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 )
 
 func Test_syncOrgRoles_doesNotBreakWhenTryingToRemoveLastOrgAdmin(t *testing.T) {
@@ -112,6 +115,28 @@ func Test_teamSync(t *testing.T) {
 	})
 }
 
+func TestUpsertUser_crashOnLog_issue62538(t *testing.T) {
+	authInfoMock := &logintest.AuthInfoServiceFake{}
+	authInfoMock.ExpectedError = models.ErrUserNotFound
+	loginsvc := Implementation{
+		QuotaService:    &quota.QuotaService{},
+		AuthInfoService: authInfoMock,
+	}
+
+	email := "test_user@example.org"
+	upsertCmd := &models.UpsertUserCommand{
+		ExternalUser:     &models.ExternalUserInfo{Email: email},
+		UserLookupParams: models.UserLookupParams{Email: &email},
+		SignupAllowed:    false,
+	}
+
+	var err error
+	require.NotPanics(t, func() {
+		err = loginsvc.UpsertUser(context.Background(), upsertCmd)
+	})
+	require.ErrorIs(t, err, login.ErrSignupNotAllowed)
+}
+
 func createSimpleUser() models.User {
 	user := models.User{
 		Id: 1,