src/de/steamwar/bungeecore/sql/Team.java

@@ -43,7 +43,9 @@ public class Team {
         teamKuerzel = kuerzel;
         teamName = name;
         teamLeader = leader;
-        teamCache.add(this);
+        if (leader != 0) {
+            teamCache.add(this);
+        }
     }
 
     private Team(ResultSet rs) throws SQLException {