diff --git a/src/pxb/android/StringItems.java b/src/pxb/android/StringItems.java
index abdb849..16ac35e 100644
--- a/src/pxb/android/StringItems.java
+++ b/src/pxb/android/StringItems.java
@@ -106,8 +106,8 @@ public void prepare() throws IOException {
 				item.dataOffset = offset;
 				map.put(stringData, offset);
 				if (useUTF8) {
-					int length = stringData.length();
-					byte[] data = stringData.getBytes("UTF-8");
+					int length = stringData == null ? 0 : stringData.length();
+					byte[] data = stringData == null ? new byte[0] : stringData.getBytes("UTF-8");
 					int u8lenght = data.length;
 
 					if (length > 0x7F) {
@@ -125,8 +125,8 @@ public void prepare() throws IOException {
 					baos.write(0);
 					offset += 3 + u8lenght;
 				} else {
-					int length = stringData.length();
-					byte[] data = stringData.getBytes("UTF-16LE");
+					int length = stringData == null ? 0 :stringData.length();
+					byte[] data = stringData == null ? new byte[0] : stringData.getBytes("UTF-16LE");
 					if (length > 0x7FFF) {
 						int x = (length >> 16) | 0x8000;
 						baos.write(x);