modules/level: Make sure variable is not changed in another thread

modules/level/scheduler.go

@@ -39,17 +39,17 @@ func ScheduleUpdates(s *discordgo.Session) {
 			}
 			if lastKnownLevel[id] != level {
 				lastKnownLevel[id] = level
-				go func() {
-					oldLevel, err := roles.GetOldLevel(s, id)
+				go func(checkID string, newLevel int) {
+					oldLevel, err := roles.GetOldLevel(s, checkID)
 					if err != nil {
 						log.Error(s, err)
 						return
 					}
-					if level > oldLevel {
-						gacha.RollReward(s, id, level-oldLevel)
-						roles.GiveLevelRoles(s, id, oldLevel, level)
+					if newLevel > oldLevel {
+						gacha.RollReward(s, checkID, newLevel-oldLevel)
+						roles.GiveLevelRoles(s, checkID, oldLevel, newLevel)
 					}
-				}()
+				}(id, level)
 			}
 		}
 		levelMutex.Unlock()