diff --git a/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/IdAllocator.java b/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/IdAllocator.java
index b8657238e..3a42d71ed 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/IdAllocator.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/IdAllocator.java
@@ -235,7 +235,7 @@ public class IdAllocator {
             sortedJsonObject.addProperty(entry.getValue(), entry.getKey());
         }
 
-        if (sortedJsonObject.isEmpty()) {
+        if (sortedJsonObject.asMap().isEmpty()) {
             if (Files.exists(this.cacheFilePath)) {
                 Files.delete(this.cacheFilePath);
             }
diff --git a/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/VisualBlockStateAllocator.java b/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/VisualBlockStateAllocator.java
index 7138465fa..7087b55d2 100644
--- a/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/VisualBlockStateAllocator.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/pack/allocator/VisualBlockStateAllocator.java
@@ -168,7 +168,7 @@ public class VisualBlockStateAllocator {
         for (Map.Entry<BlockStateWrapper, String> entry : sortedById.entrySet()) {
             sortedJsonObject.addProperty(entry.getValue(), entry.getKey().getAsString());
         }
-        if (sortedJsonObject.isEmpty()) {
+        if (sortedJsonObject.asMap().isEmpty()) {
             if (Files.exists(this.cacheFilePath)) {
                 Files.delete(this.cacheFilePath);
             }