Fix GameModeConfig

CommonCore/SQL/src/de/steamwar/sql/GameModeConfig.java

@@ -30,6 +30,7 @@ import java.time.LocalDateTime;
 import java.util.*;
 import java.util.function.Function;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 @ToString
 public final class GameModeConfig<M, W> {
@@ -710,13 +711,26 @@ public final class GameModeConfig<M, W> {
             Map<Set<M>, Integer> Limited = new HashMap<>();
             for (Map<?, ?> entry : loader.getMapList("Limited")) {
                 int amount = (Integer) entry.get("Amount");
-                Set<String> materials = new HashSet<>((List<String>) entry.get("Materials"));
+                Set<M> materials = Stream.of((List<String>) entry.get("Materials"))
+                        .filter(Objects::nonNull)
+                        .flatMap(List::stream)
+                        .map(String::toUpperCase)
+                        .map(material -> {
+                            try {
+                                return loader.materialMapper.apply(material);
+                            } catch (Exception e) {
+                                return null;
+                            }
+                        })
+                        .filter(Objects::nonNull)
+                        .collect(Collectors.toSet());
+
                 if (amount == 0) {
                     materials.forEach(material -> {
-                        Limited.put(Collections.singleton(loader.materialMapper.apply(material.toUpperCase())), 0);
+                        Limited.put(Collections.singleton(material), 0);
                     });
                 } else {
-                    Limited.put(Collections.unmodifiableSet(materials.stream().map(String::toUpperCase).map(loader.materialMapper).collect(Collectors.toSet())), amount);
+                    Limited.put(materials, amount);
                 }
             }
             SQLWrapper.impl.getMaterialWithGreaterBlastResistance(MaxBlastResistance).forEach(material -> {