diff --git a/android/src/com/reecedunn/espeak/TtsService.java b/android/src/com/reecedunn/espeak/TtsService.java
index 2235d456653ed010a38d56c9753d99c4869943a7..d8f7dbf2ae3f242562434d7b3ee30e2a9ed080c7 100644
--- a/android/src/com/reecedunn/espeak/TtsService.java
+++ b/android/src/com/reecedunn/espeak/TtsService.java
@@ -94,7 +94,9 @@ public class TtsService extends TextToSpeechService {
         if (mOnLanguagesDownloaded != null) {
             unregisterReceiver(mOnLanguagesDownloaded);
         }
-        mAsyncExtract.cancel(true);
+        if (mAsyncExtract != null) {
+            mAsyncExtract.cancel(true);
+        }
     }
 
     /**
@@ -120,12 +122,12 @@ public class TtsService extends TextToSpeechService {
     protected String[] onGetLanguage() {
         // This is used to specify the language requested from GetSampleText.
         if (mMatchingVoice == null) {
-            return new String[] { "eng", "GBR", "" };
+            return new String[]{"eng", "GBR", ""};
         }
-        return new String[] {
-            mMatchingVoice.locale.getISO3Language(),
-            mMatchingVoice.locale.getISO3Country(),
-            mMatchingVoice.locale.getVariant()
+        return new String[]{
+                mMatchingVoice.locale.getISO3Language(),
+                mMatchingVoice.locale.getISO3Country(),
+                mMatchingVoice.locale.getVariant()
         };
     }
 
@@ -146,17 +148,17 @@ public class TtsService extends TextToSpeechService {
             final File dataPath = CheckVoiceData.getDataPath(this).getParentFile();
 
             mAsyncExtract = new AsyncExtract(this, R.raw.espeakdata, dataPath) {
-	            @Override
-	            protected void onPostExecute(Integer result) {
-	                switch (result) {
-	                    case RESULT_OK:
-	                        final Intent intent = new Intent(DownloadVoiceData.BROADCAST_LANGUAGES_UPDATED);
-	                        sendBroadcast(intent);
-	                        break;
-	                    case RESULT_CANCELED:
-	                        // Do nothing?
-	                        break;
-	                }
+                @Override
+                protected void onPostExecute(Integer result) {
+                    switch (result) {
+                        case RESULT_OK:
+                            final Intent intent = new Intent(DownloadVoiceData.BROADCAST_LANGUAGES_UPDATED);
+                            sendBroadcast(intent);
+                            break;
+                        case RESULT_CANCELED:
+                            // Do nothing?
+                            break;
+                    }
                 }
             };
 
@@ -320,8 +322,7 @@ public class TtsService extends TextToSpeechService {
             }
         }
 
-        if (text.startsWith("<?xml"))
-        {
+        if (text.startsWith("<?xml")) {
             // eSpeak does not recognise/skip "<?...?>" preprocessing tags,
             // so need to remove these before passing to synthesize.
             text = text.substring(text.indexOf("?>") + 2).trim();
@@ -371,8 +372,8 @@ public class TtsService extends TextToSpeechService {
 
 
     /**
-    * Begin voice data download here instead of an activity.
-    */
+     * Begin voice data download here instead of an activity.
+     */
 
     private static final int PROGRESS_STARTING = 0;
     private static final int PROGRESS_EXTRACTING = 1;