diff --git a/models/repo_statistic.go b/models/repo_statistic.go
index f7c3029da..a9e9593af 100755
--- a/models/repo_statistic.go
+++ b/models/repo_statistic.go
@@ -17,7 +17,7 @@ type RepoStatistic struct {
 	IsPrivate            bool               `json:"isPrivate"`
 	IsMirror             bool               `json:"isMirror"`
 	IsFork               bool               `json:"isFork"`
-	RepoCreatedUnix      timeutil.TimeStamp `xorm:"NOT NULL" json:"createUnix"`
+	RepoCreatedUnix      timeutil.TimeStamp `xorm:"NOT NULL DEFAULT 0" json:"createUnix"`
 	Date                 string             `xorm:"unique(s) NOT NULL" json:"date"`
 	NumWatches           int64              `xorm:"NOT NULL DEFAULT 0" json:"watch"`
 	NumWatchesAdded      int64              `xorm:"NOT NULL DEFAULT 0" json:"-"`