Code snippet that causes a NullPointerException in ProGuard 4.7

ProGuard_4.7_npe.java

public static Bitmap overlayBitmap(Bitmap bitmap , Bitmap overlay, float overlayRatio) {
  	Bitmap outputBitmap = null;		
		Bitmap resizedOverlay = null;
		try {			
			if (null == bitmap || null == overlay) {
				return overlay;
			}	
			
			...
	        
	        Canvas cs = new Canvas(outputBitmap);		        
        	try {
        		cs = null;
		} catch (Throwable thr) {
				//log

		} finally {
			if (null != resizedOverlay) {
				try {
	        		resizedOverlay.recycle();
	        	} catch (Throwable thr) {
	        	} finally {
	        			// If we move this statement out of its finally and remove the finally,
	        			// then ProGuard does not throw an exception
					resizedOverlay = null;
				}
			}
		}
	return outputBitmap;		
}