diff --git a/repositories.go b/repositories.go
index 178472f..f6eb53f 100644
--- a/repositories.go
+++ b/repositories.go
@@ -511,7 +511,7 @@ func TriggerTagUpdate(c *gin.Context, work *Work, repo *Repository, u *User, tag
 	loggeduser := c.MustGet("LoggedUser").(*User)
 	now := time.Now()
 
-	if !loggeduser.IsAdmin && (!work.Shown || work.Corrected || work.StartAvailability.After(now) || work.EndAvailability.Add(time.Hour).Before(now)) {
+	if (loggeduser == nil || !loggeduser.IsAdmin) && (!work.Shown || work.Corrected || work.StartAvailability.After(now) || work.EndAvailability.Add(time.Hour).Before(now)) {
 		c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"errmsg": "The submission is closed."})
 		return
 	}