diff --git a/src/main/java/com/songoda/epicenchants/utils/single/ItemGroup.java b/src/main/java/com/songoda/epicenchants/utils/single/ItemGroup.java
index 8c27a2a..613427d 100644
--- a/src/main/java/com/songoda/epicenchants/utils/single/ItemGroup.java
+++ b/src/main/java/com/songoda/epicenchants/utils/single/ItemGroup.java
@@ -61,7 +61,7 @@ public class ItemGroup {
         for (int i = 0; i < 5; i++) {
             getGroup(materials).ifPresent(group -> {
                 groups.add(group.getName());
-                materials.removeAll(getMaterials(group));
+                materials.removeAll(getMaterials(group).stream().map(e -> CompatibleMaterial.getMaterial(e)).collect(Collectors.toList()));
             });
         }