diff --git a/build.gradle b/build.gradle
index 21c68c1..ee304c3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -20,7 +20,7 @@ plugins {
     id "net.minecraftforge.gradle.forge" version "2.0.2"
 }
 */
-version = "1.10.2-1.7"
+version = "1.10.2-1.7b"
 group= "wanion.unidict" // http://maven.apache.org/guides/mini/guide-naming-conventions.html
 archivesBaseName = "UniDict"
 
diff --git a/src/main/java/wanion/unidict/common/Reference.java b/src/main/java/wanion/unidict/common/Reference.java
index 923488b..680281e 100644
--- a/src/main/java/wanion/unidict/common/Reference.java
+++ b/src/main/java/wanion/unidict/common/Reference.java
@@ -14,7 +14,7 @@ public final class Reference
 {
     public static final String MOD_ID = "UniDict";
     public static final String MOD_NAME = MOD_ID;
-    public static final String MOD_VERSION = "1.10.2-1.7";
+    public static final String MOD_VERSION = "1.10.2-1.7b";
     public static final char SLASH = separatorChar;
     public static final String MC_VERSION = "[1.10.2]";
 
diff --git a/src/main/java/wanion/unidict/resource/Resource.java b/src/main/java/wanion/unidict/resource/Resource.java
index 2559f16..8c609c6 100644
--- a/src/main/java/wanion/unidict/resource/Resource.java
+++ b/src/main/java/wanion/unidict/resource/Resource.java
@@ -77,8 +77,9 @@ public int getChildrenCount()
     public Resource filteredClone(final TIntList kindList)
     {
         final TIntObjectMap<UniResourceContainer> newChildrenMap = new TIntObjectHashMap<>();
+        final TIntSet kindSet = new TIntHashSet(kindList);
         childrenMap.forEachEntry((child, container) -> {
-            if (childrenExists(kindList))
+            if (kindSet.contains(child))
                 newChildrenMap.put(child, container);
             return true;
         });
diff --git a/src/main/java/wanion/unidict/resource/UniResourceHandler.java b/src/main/java/wanion/unidict/resource/UniResourceHandler.java
index ca51c10..19319da 100644
--- a/src/main/java/wanion/unidict/resource/UniResourceHandler.java
+++ b/src/main/java/wanion/unidict/resource/UniResourceHandler.java
@@ -9,6 +9,7 @@
  */
 
 import com.google.common.collect.Sets;
+import gnu.trove.list.TIntList;
 import gnu.trove.map.hash.THashMap;
 import gnu.trove.map.hash.TIntObjectHashMap;
 import gnu.trove.set.TLongSet;
@@ -143,7 +144,8 @@ private void createResources()
             });
             apiResourceMap.put(resourceName, new Resource(resourceName, kindMap));
         });
-        Config.metalsToUnify.stream().filter(apiResourceMap::containsKey).forEach(resourceName -> resourceMap.put(resourceName, apiResourceMap.get(resourceName).filteredClone(Resource.kindNamesToKindList(Config.childrenOfMetals.toArray(new String[Config.childrenOfMetals.size()]))).setSortOfChildren(true)));
+        final TIntList kindList = Resource.kindNamesToKindList(Config.childrenOfMetals.toArray(new String[Config.childrenOfMetals.size()]));
+        Config.metalsToUnify.stream().filter(apiResourceMap::containsKey).forEach(resourceName -> resourceMap.put(resourceName, apiResourceMap.get(resourceName).filteredClone(kindList).setSortOfChildren(true)));
         if (!Config.customUnifiedResources.isEmpty()) {
             Config.customUnifiedResources.forEach((resourceName, kinds) -> {
                 final Resource customResource = resourceMap.containsKey(resourceName) ? resourceMap.get(resourceName) : new Resource(resourceName);
diff --git a/src/main/resources/mcmod.info b/src/main/resources/mcmod.info
index db4dc71..05fee3f 100644
--- a/src/main/resources/mcmod.info
+++ b/src/main/resources/mcmod.info
@@ -3,7 +3,7 @@
   "modid": "UniDict",
   "name": "UniDict",
   "description": "a mod about unifying all the things.",
-  "version": "1.7",
+  "version": "1.7b",
   "mcversion": "${mcversion}",
   "url": "http://minecraft.curseforge.com/projects/unidict",
   "updateUrl": "",