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

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