fix #1997

modules/middleware/repo.go

@@ -275,7 +275,7 @@ func RepoAssignment(redirect bool, args ...bool) macaron.Handler {
 		}
 
 		// Admin has super access.
-		if ctx.User.IsAdmin {
+		if ctx.IsSigned && ctx.User.IsAdmin {
 			ctx.Repo.AccessMode = models.ACCESS_MODE_OWNER
 		} else {
 			mode, err := models.AccessLevel(ctx.User, repo)