diff --git a/src/main/java/com/reandroid/apk/ResourceIds.java b/src/main/java/com/reandroid/apk/ResourceIds.java
index d481d04..7ebcc87 100644
--- a/src/main/java/com/reandroid/apk/ResourceIds.java
+++ b/src/main/java/com/reandroid/apk/ResourceIds.java
@@ -742,9 +742,15 @@ import java.util.*;
                         writer.write("<public id=\"");
                         writer.write(getHexId());
                         writer.write("\" type=\"");
-                        writer.write(getTypeName());
+                        String str = getTypeName();
+                        if(str != null){
+                            writer.write(str);
+                        }
                         writer.write("\" name=\"");
-                        writer.write(getName());
+                        str = getName();
+                        if(str != null){
+                            writer.write(str);
+                        }
                         writer.write("\"/>");
                     }
                     @Override
diff --git a/src/main/java/com/reandroid/arsc/chunk/PackageBlock.java b/src/main/java/com/reandroid/arsc/chunk/PackageBlock.java
index 0ed69f5..c23028b 100755
--- a/src/main/java/com/reandroid/arsc/chunk/PackageBlock.java
+++ b/src/main/java/com/reandroid/arsc/chunk/PackageBlock.java
@@ -241,7 +241,7 @@ public class PackageBlock extends Chunk<PackageHeader>
     private void createEntryGroupMap(Map<Integer, EntryGroup> map){
         map.clear();
         for(SpecTypePair specTypePair:listAllSpecTypePair()){
-            map.putAll(specTypePair.createEntryGroups());
+            map.putAll(specTypePair.createEntryGroups(true));
         }
     }
     public Map<Integer, EntryGroup> getEntriesGroupMap(){
diff --git a/src/main/java/com/reandroid/arsc/container/SpecTypePair.java b/src/main/java/com/reandroid/arsc/container/SpecTypePair.java
index d23ed02..05d1ada 100755
--- a/src/main/java/com/reandroid/arsc/container/SpecTypePair.java
+++ b/src/main/java/com/reandroid/arsc/container/SpecTypePair.java
@@ -68,10 +68,13 @@ public class SpecTypePair extends BlockContainer<Block>
         }
     }
     public Map<Integer, EntryGroup> createEntryGroups(){
+        return createEntryGroups(false);
+    }
+    public Map<Integer, EntryGroup> createEntryGroups(boolean skipNullEntries){
         Map<Integer, EntryGroup> map = new HashMap<>();
         for(TypeBlock typeBlock:listTypeBlocks()){
             EntryArray entryArray = typeBlock.getEntryArray();
-            for(Entry entry:entryArray.listItems()){
+            for(Entry entry:entryArray.listItems(skipNullEntries)){
                 if(entry==null){
                     continue;
                 }
diff --git a/src/main/java/com/reandroid/arsc/value/ValueItem.java b/src/main/java/com/reandroid/arsc/value/ValueItem.java
index 1a1cc26..5dfdf32 100755
--- a/src/main/java/com/reandroid/arsc/value/ValueItem.java
+++ b/src/main/java/com/reandroid/arsc/value/ValueItem.java
@@ -42,7 +42,9 @@ import java.util.Objects;
      }
 
      void linkTableStrings(TableStringPool tableStringPool){
-         linkStringReference(tableStringPool);
+         if(getValueType() == ValueType.STRING){
+             linkStringReference(tableStringPool);
+         }
      }
      public void onRemoved(){
          unLinkStringReference();