diff --git a/src/main/java/android/content/res/AXmlResourceParser.java b/src/main/java/android/content/res/AXmlResourceParser.java
old mode 100644
new mode 100755
index 7397749..ac8bc41
--- a/src/main/java/android/content/res/AXmlResourceParser.java
+++ b/src/main/java/android/content/res/AXmlResourceParser.java
@@ -287,7 +287,10 @@ public String getAttributeValue(int index) {
 		int valueType=m_attributes[offset+ATTRIBUTE_IX_VALUE_TYPE];
 		if (valueType==TypedValue.TYPE_STRING) {
 			int valueString=m_attributes[offset+ATTRIBUTE_IX_VALUE_STRING];
-			return m_strings.getString(valueString);
+			String value = m_strings.getString(valueString);
+			if (value != null) {
+				return value;
+			}
 		}
 		int valueData=m_attributes[offset+ATTRIBUTE_IX_VALUE_DATA];
 		return "";//TypedValue.coerceToString(valueType,valueData);
diff --git a/src/main/java/com/bigzhao/xml2axml/chunks/AttrChunk.java b/src/main/java/com/bigzhao/xml2axml/chunks/AttrChunk.java
old mode 100644
new mode 100755
index 5d4d9e2..8752982
--- a/src/main/java/com/bigzhao/xml2axml/chunks/AttrChunk.java
+++ b/src/main/java/com/bigzhao/xml2axml/chunks/AttrChunk.java
@@ -1,5 +1,6 @@
 package com.bigzhao.xml2axml.chunks;
 
+import android.text.TextUtils;
 import android.graphics.Color;
 
 import com.bigzhao.xml2axml.ComplexConsts;
@@ -38,7 +39,7 @@ public void preWrite() {
 
     @Override
     public void writeEx(IntWriter w) throws IOException {
-        w.write(startTagChunk.stringIndex(null,namespace));
+        w.write(startTagChunk.stringIndex(null, TextUtils.isEmpty(namespace) ? null : namespace));
         w.write(startTagChunk.stringIndex(namespace,name));
         //w.write(-1);
         if (value.type==ValueType.STRING)
diff --git a/src/main/java/com/bigzhao/xml2axml/chunks/StringPoolChunk.java b/src/main/java/com/bigzhao/xml2axml/chunks/StringPoolChunk.java
old mode 100644
new mode 100755
index acaaeb6..295a967
--- a/src/main/java/com/bigzhao/xml2axml/chunks/StringPoolChunk.java
+++ b/src/main/java/com/bigzhao/xml2axml/chunks/StringPoolChunk.java
@@ -222,12 +222,13 @@ public void addString(String namespace, String s){
     public int stringIndex(String namespace, String s) {
         namespace=preHandleString(namespace);
         s=preHandleString(s);
-        if (TextUtils.isEmpty(s)) return -1;
+        if (s == null) return -1;
         int l=rawStrings.size();
         for (int i=0;i<l;++i){
             StringItem item=rawStrings.get(i).origin;
             if (s.equals(item.string)&&(TextUtils.isEmpty(namespace)||namespace.equals(item.namespace))) return i;
         }
+        if (TextUtils.isEmpty(s)) return -1;  // only if there is no empty string in the string pool
         throw new RuntimeException("String: '"+s+"' not found");
         //return -1;
     }