Fixed multiple custom generator rates overriding each other in database

src/main/java/com/bgsoftware/superiorskyblock/database/serialization/IslandsDeserializer.java

@@ -8,6 +8,7 @@
 import com.bgsoftware.superiorskyblock.api.island.IslandPrivilege;
 import com.bgsoftware.superiorskyblock.api.island.PlayerRole;
 import com.bgsoftware.superiorskyblock.api.key.Key;
+import com.bgsoftware.superiorskyblock.api.key.KeyMap;
 import com.bgsoftware.superiorskyblock.api.missions.Mission;
 import com.bgsoftware.superiorskyblock.api.wrappers.SuperiorPlayer;
 import com.bgsoftware.superiorskyblock.database.DatabaseResult;
@@ -508,8 +509,12 @@ public static void deserializeGenerators(DatabaseBridge databaseBridge, Database
             }
 
             CachedIslandInfo cachedIslandInfo = databaseCache.computeIfAbsentInfo(uuid.get(), CachedIslandInfo::new);
-            (cachedIslandInfo.cobbleGeneratorValues[environment.get()] = KeyMapImpl.createHashMap())
-                    .put(block.get(), rate.get() < 0 ? Value.syncedFixed(rate.get()) : Value.fixed(rate.get()));
+            KeyMap<Value<Integer>> generatorRates = cachedIslandInfo.cobbleGeneratorValues[environment.get()];
+
+            if (generatorRates == null)
+                generatorRates = cachedIslandInfo.cobbleGeneratorValues[environment.get()] = KeyMapImpl.createHashMap();
+
+            generatorRates.put(block.get(), rate.get() < 0 ? Value.syncedFixed(rate.get()) : Value.fixed(rate.get()));
         });
     }