diff --git a/org.envirocar.app/AndroidManifest.xml b/org.envirocar.app/AndroidManifest.xml
index 5cf72d4ed..80932e9ec 100644
--- a/org.envirocar.app/AndroidManifest.xml
+++ b/org.envirocar.app/AndroidManifest.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.envirocar.app"
-    android:versionCode="21"
-    android:versionName="0.9.0">
+    android:versionCode="22"
+    android:versionName="0.9.1">
 
     <uses-sdk
         android:minSdkVersion="10"
@@ -92,4 +92,4 @@
         </activity>
     </application>
 
-</manifest>
\ No newline at end of file
+</manifest>
diff --git a/org.envirocar.app/src/org/envirocar/app/activity/DashboardFragment.java b/org.envirocar.app/src/org/envirocar/app/activity/DashboardFragment.java
index a8ad96be8..8ef196bab 100644
--- a/org.envirocar.app/src/org/envirocar/app/activity/DashboardFragment.java
+++ b/org.envirocar.app/src/org/envirocar/app/activity/DashboardFragment.java
@@ -262,7 +262,13 @@ public void onDestroy() {
 		logger.info("onDestroy. hash="+System.identityHashCode(this));
 		super.onDestroy();
 		
-		getActivity().unregisterReceiver(receiver);
+		try {
+			getActivity().unregisterReceiver(receiver);
+		}
+		catch (IllegalArgumentException e) {
+			logger.warn(e.getMessage(), e);
+			logger.warn("Reconsider the Receiver registration lifecycle!");
+		}
 		if (preferences != null) {
 			preferences.unregisterOnSharedPreferenceChangeListener(preferenceListener);
 		}
diff --git a/org.envirocar.app/src/org/envirocar/app/activity/ListTracksFragment.java b/org.envirocar.app/src/org/envirocar/app/activity/ListTracksFragment.java
index 381bb75c6..d1d8ebd61 100644
--- a/org.envirocar.app/src/org/envirocar/app/activity/ListTracksFragment.java
+++ b/org.envirocar.app/src/org/envirocar/app/activity/ListTracksFragment.java
@@ -212,14 +212,27 @@ private void updateUsabilityOfMenuItems() {
 			
 			@Override
 			public void run() {
+				Menu theMenu = menu;
+				
+				if (theMenu == null) {
+					return;
+				}
+				
 				if (dbAdapter.getAllLocalTracks().size() > 0) {
-					menu.findItem(R.id.menu_delete_all).setEnabled(true);
-					menu.findItem(R.id.menu_upload).setEnabled(UserManager.instance().isLoggedIn());
+					setItemEnabled(theMenu.findItem(R.id.menu_delete_all), true);
+					setItemEnabled(theMenu.findItem(R.id.menu_upload), UserManager.instance().isLoggedIn());
 				} else {
-					menu.findItem(R.id.menu_upload).setEnabled(false);
-					menu.findItem(R.id.menu_delete_all).setEnabled(false);
+					setItemEnabled(theMenu.findItem(R.id.menu_upload), false);
+					setItemEnabled(theMenu.findItem(R.id.menu_delete_all), false);
 				}				
 			}
+
+			private void setItemEnabled(com.actionbarsherlock.view.MenuItem item,
+					boolean b) {
+				if (item != null) {
+					item.setEnabled(b);
+				}
+			}
 		});
 	}
 	
diff --git a/org.envirocar.app/src/org/envirocar/app/activity/MainActivity.java b/org.envirocar.app/src/org/envirocar/app/activity/MainActivity.java
index 66de22913..26a32d8b9 100644
--- a/org.envirocar.app/src/org/envirocar/app/activity/MainActivity.java
+++ b/org.envirocar.app/src/org/envirocar/app/activity/MainActivity.java
@@ -681,9 +681,11 @@ protected void onDestroy() {
 
 		this.unregisterReceiver(bluetoothStateReceiver);
 		this.unregisterReceiver(deviceDiscoveryStateReceiver);
-		this.unregisterReceiver(errorInformationReceiver);
+		
 		this.unregisterReceiver(serviceStateReceiver);
 		
+		this.unregisterReceiver(errorInformationReceiver);
+		
 		if (remainingTimeHandler != null) {
 			remainingTimeHandler.removeCallbacks(remainingTimeThread);
 			discoveryTargetTime = 0;
diff --git a/org.envirocar.app/src/org/envirocar/app/bluetooth/BluetoothConnection.java b/org.envirocar.app/src/org/envirocar/app/bluetooth/BluetoothConnection.java
index 60748ae1a..fc10cdfc1 100644
--- a/org.envirocar.app/src/org/envirocar/app/bluetooth/BluetoothConnection.java
+++ b/org.envirocar.app/src/org/envirocar/app/bluetooth/BluetoothConnection.java
@@ -176,6 +176,7 @@ public void run() {
             	break;
 	            		
             } catch (IOException e) {
+            	logger.warn("Exception on bluetooth connection. Trying the fallback... : "+e.getMessage(), e);
             	//try the fallback
             	try {
             		if (running) {
@@ -186,7 +187,7 @@ public void run() {
     	            	break;	
             		}
 				} catch (FallbackException e1) {
-					logger.warn("Could not initialize FallbackBluetoothSocket classes.", e);
+					logger.warn("Could not initialize FallbackBluetoothSocket classes: "+e1.getMessage(), e1);
 				} catch (InterruptedException e1) {
 					logger.warn(e1.getMessage(), e1);
 				} catch (IOException e1) {
@@ -224,7 +225,7 @@ private boolean selectSocket() {
             bluetoothSocket = new NativeBluetoothSocket(tmp);
             return true;
         } catch (IOException e) {
-        	logger.warn(e.getMessage() ,e);
+        	logger.warn(e.getMessage(), e);
         }
 		
 		return false;
diff --git a/org.envirocar.app/src/org/envirocar/app/protocol/drivedeck/DriveDeckSportConnector.java b/org.envirocar.app/src/org/envirocar/app/protocol/drivedeck/DriveDeckSportConnector.java
index c063faf37..dc7030693 100644
--- a/org.envirocar.app/src/org/envirocar/app/protocol/drivedeck/DriveDeckSportConnector.java
+++ b/org.envirocar.app/src/org/envirocar/app/protocol/drivedeck/DriveDeckSportConnector.java
@@ -144,7 +144,19 @@ private void updateConnectionState() {
 	}
 
 	private void determineProtocol(String protocolInt) {
-		int prot = Integer.parseInt(protocolInt);
+		if (protocolInt == null || protocolInt.trim().isEmpty()) {
+			return;
+		}
+		
+		int prot;
+		try {
+			prot = Integer.parseInt(protocolInt);
+		}
+		catch (NumberFormatException e) {
+			logger.warn("NFE: "+e.getMessage());
+			return;
+		}
+		
 		switch (prot) {
 		case 1:
 			protocol = Protocol.CAN11500;