diff --git a/models/notification.go b/models/notification.go
index 9258b68f2..80d837078 100644
--- a/models/notification.go
+++ b/models/notification.go
@@ -199,10 +199,18 @@ func createOrUpdateIssueNotifications(e Engine, issueID, commentID, notification
 	// notify
 	for userID := range toNotify {
 		issue.Repo.Units = nil
-		if issue.IsPull && !issue.Repo.checkUnitUser(e, userID, false, UnitTypePullRequests) {
+		user, err := getUserByID(e, userID)
+		if err != nil {
+			if IsErrUserNotExist(err) {
+				continue
+			}
+
+			return err
+		}
+		if issue.IsPull && !issue.Repo.checkUnitUser(e, user, UnitTypePullRequests) {
 			continue
 		}
-		if !issue.IsPull && !issue.Repo.checkUnitUser(e, userID, false, UnitTypeIssues) {
+		if !issue.IsPull && !issue.Repo.checkUnitUser(e, user, UnitTypeIssues) {
 			continue
 		}
 
diff --git a/models/repo.go b/models/repo.go
index d9b657697..2bbc74f43 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -425,20 +425,17 @@ func (repo *Repository) getUnits(e Engine) (err error) {
 }
 
 // CheckUnitUser check whether user could visit the unit of this repository
-func (repo *Repository) CheckUnitUser(userID int64, isAdmin bool, unitType UnitType) bool {
-	return repo.checkUnitUser(x, userID, isAdmin, unitType)
+func (repo *Repository) CheckUnitUser(user *User, unitType UnitType) bool {
+	return repo.checkUnitUser(x, user, unitType)
 }
 
-func (repo *Repository) checkUnitUser(e Engine, userID int64, isAdmin bool, unitType UnitType) bool {
-	if isAdmin {
+func (repo *Repository) checkUnitUser(e Engine, user *User, unitType UnitType) bool {
+	if user.IsAdmin {
 		return true
 	}
-	user, err := getUserByID(e, userID)
-	if err != nil {
-		return false
-	}
 	perm, err := getUserRepoPermission(e, repo, user)
 	if err != nil {
+		log.Error("getUserRepoPermission(): %v", err)
 		return false
 	}
 
diff --git a/routers/home.go b/routers/home.go
index 542567087..d37bf8e31 100644
--- a/routers/home.go
+++ b/routers/home.go
@@ -303,10 +303,8 @@ func ExploreCode(ctx *context.Context) {
 		repoIDs []int64
 		err     error
 		isAdmin bool
-		userID  int64
 	)
 	if ctx.User != nil {
-		userID = ctx.User.ID
 		isAdmin = ctx.User.IsAdmin
 	}
 
@@ -336,7 +334,7 @@ func ExploreCode(ctx *context.Context) {
 		var rightRepoMap = make(map[int64]*models.Repository, len(repoMaps))
 		repoIDs = make([]int64, 0, len(repoMaps))
 		for id, repo := range repoMaps {
-			if repo.CheckUnitUser(userID, isAdmin, models.UnitTypeCode) {
+			if repo.CheckUnitUser(ctx.User, models.UnitTypeCode) {
 				rightRepoMap[id] = repo
 				repoIDs = append(repoIDs, id)
 			}
diff --git a/routers/repo/repo.go b/routers/repo/repo.go
index 9a4fbfa13..d12640dd6 100644
--- a/routers/repo/repo.go
+++ b/routers/repo/repo.go
@@ -140,7 +140,7 @@ func Create(ctx *context.Context) {
 	templateID := ctx.QueryInt64("template_id")
 	if templateID > 0 {
 		templateRepo, err := models.GetRepositoryByID(templateID)
-		if err == nil && templateRepo.CheckUnitUser(ctxUser.ID, ctxUser.IsAdmin, models.UnitTypeCode) {
+		if err == nil && templateRepo.CheckUnitUser(ctxUser, models.UnitTypeCode) {
 			ctx.Data["repo_template"] = templateID
 			ctx.Data["repo_template_name"] = templateRepo.Name
 		}