diff --git a/models/repo/repo.go b/models/repo/repo.go
index efbd6812a1..258eebc653 100644
--- a/models/repo/repo.go
+++ b/models/repo/repo.go
@@ -681,6 +681,9 @@ func getGroupSegment(gid int64) string {
 }
 
 func groupSegmentWithTrailingSlash(gid int64) string {
+	if gid < 1 {
+		return ""
+	}
 	return getGroupSegment(gid) + "/"
 }