Bug fixing

src/main/java/world/bentobox/level/Level.java

@@ -100,7 +100,7 @@ public class Level extends Addon implements Listener {
     @EventHandler
     public void onBentoBoxReady(BentoBoxReadyEvent e) {
         // Perform upgrade check
-        manager.migrate(this);
+        manager.migrate();
         // Load TopTens
         manager.loadTopTens();
         /*

src/main/java/world/bentobox/level/LevelsManager.java

@@ -87,7 +87,7 @@ public class LevelsManager {
         background = new PanelItemBuilder().icon(Material.BLACK_STAINED_GLASS_PANE).name(" ").build();
     }
 
-    public void migrate(Level addon2) {
+    public void migrate() {
         Database<LevelsData> oldDb = new Database<>(addon, LevelsData.class);
         oldDb.loadObjects().forEach(ld -> {
             try {
@@ -323,9 +323,7 @@ public class LevelsManager {
      * @return initial level of island
      */
     public long getInitialLevel(Island island) {
-        @Nullable
-        IslandLevels ld = getLevelsData(island);
-        return ld == null ? 0 : ld.getInitialLevel();
+        return getLevelsData(island).getInitialLevel();
     }
 
     /**

src/main/java/world/bentobox/level/objects/IslandLevels.java

@@ -1,6 +1,6 @@
 package world.bentobox.level.objects;
 
-import java.util.HashMap;
+import java.util.EnumMap;
 import java.util.Map;
 
 import org.bukkit.Material;
@@ -60,8 +60,8 @@ public class IslandLevels implements DataObject {
      */
     public IslandLevels(String islandUUID) {
         uniqueId = islandUUID;
-        uwCount = new HashMap<>();
-        mdCount = new HashMap<>();
+        uwCount = new EnumMap<>(Material.class);
+        mdCount = new EnumMap<>(Material.class);
     }
 
     /**
@@ -151,6 +151,4 @@ public class IslandLevels implements DataObject {
     }
 
 
-
-
 }

src/test/java/world/bentobox/level/LevelsManagerTest.java

@@ -225,7 +225,7 @@ public class LevelsManagerTest {
         when(iwm.getPermissionPrefix(any())).thenReturn("bskyblock.");
 
         lm = new LevelsManager(addon);
-        lm.migrate(addon);
+        lm.migrate();
     }
 
     /**