diff --git a/services/convert/convert.go b/services/convert/convert.go
index 366782390a7..860c3ef03a0 100644
--- a/services/convert/convert.go
+++ b/services/convert/convert.go
@@ -308,40 +308,38 @@ func ToTeam(ctx context.Context, team *organization.Team, loadOrg ...bool) (*api
 
 // ToTeams convert models.Team list to api.Team list
 func ToTeams(ctx context.Context, teams []*organization.Team, loadOrgs bool) ([]*api.Team, error) {
-	if len(teams) == 0 || teams[0] == nil {
-		return nil, nil
-	}
-
 	cache := make(map[int64]*api.Organization)
-	apiTeams := make([]*api.Team, len(teams))
-	for i := range teams {
-		if err := teams[i].LoadUnits(ctx); err != nil {
+	apiTeams := make([]*api.Team, 0, len(teams))
+	for _, t := range teams {
+		if err := t.LoadUnits(ctx); err != nil {
 			return nil, err
 		}
 
-		apiTeams[i] = &api.Team{
-			ID:                      teams[i].ID,
-			Name:                    teams[i].Name,
-			Description:             teams[i].Description,
-			IncludesAllRepositories: teams[i].IncludesAllRepositories,
-			CanCreateOrgRepo:        teams[i].CanCreateOrgRepo,
-			Permission:              teams[i].AccessMode.String(),
-			Units:                   teams[i].GetUnitNames(),
-			UnitsMap:                teams[i].GetUnitsMap(),
+		apiTeam := &api.Team{
+			ID:                      t.ID,
+			Name:                    t.Name,
+			Description:             t.Description,
+			IncludesAllRepositories: t.IncludesAllRepositories,
+			CanCreateOrgRepo:        t.CanCreateOrgRepo,
+			Permission:              t.AccessMode.String(),
+			Units:                   t.GetUnitNames(),
+			UnitsMap:                t.GetUnitsMap(),
 		}
 
 		if loadOrgs {
-			apiOrg, ok := cache[teams[i].OrgID]
+			apiOrg, ok := cache[t.OrgID]
 			if !ok {
-				org, err := organization.GetOrgByID(ctx, teams[i].OrgID)
+				org, err := organization.GetOrgByID(ctx, t.OrgID)
 				if err != nil {
 					return nil, err
 				}
 				apiOrg = ToOrganization(ctx, org)
-				cache[teams[i].OrgID] = apiOrg
+				cache[t.OrgID] = apiOrg
 			}
-			apiTeams[i].Organization = apiOrg
+			apiTeam.Organization = apiOrg
 		}
+
+		apiTeams = append(apiTeams, apiTeam)
 	}
 	return apiTeams, nil
 }
diff --git a/services/convert/pull_review.go b/services/convert/pull_review.go
index 0332606285d..aa7ad68a478 100644
--- a/services/convert/pull_review.go
+++ b/services/convert/pull_review.go
@@ -21,15 +21,9 @@ func ToPullReview(ctx context.Context, r *issues_model.Review, doer *user_model.
 		r.Reviewer = user_model.NewGhostUser()
 	}
 
-	apiTeam, err := ToTeam(ctx, r.ReviewerTeam)
-	if err != nil {
-		return nil, err
-	}
-
 	result := &api.PullReview{
 		ID:                r.ID,
 		Reviewer:          ToUser(ctx, r.Reviewer, doer),
-		ReviewerTeam:      apiTeam,
 		State:             api.ReviewStateUnknown,
 		Body:              r.Content,
 		CommitID:          r.CommitID,
@@ -43,6 +37,14 @@ func ToPullReview(ctx context.Context, r *issues_model.Review, doer *user_model.
 		HTMLPullURL:       r.Issue.HTMLURL(),
 	}
 
+	if r.ReviewerTeam != nil {
+		var err error
+		result.ReviewerTeam, err = ToTeam(ctx, r.ReviewerTeam)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	switch r.Type {
 	case issues_model.ReviewTypeApprove:
 		result.State = api.ReviewStateApproved