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java.util.ConcurrentModificationException: 	at java.util.AbstractList$SubAbstractList.size(AbstractList.java:360)	at java.util.AbstractCollection.toArray(AbstractCollection.java:339)	at java.util.ArrayList.(ArrayList.java:93)	at com.vlille.checker.ui.async.AbstractStationsAsyncTask.doInBackground(AbstractStationsAsyncTask.java:17)	at android.os.AsyncTask$2.call(AsyncTask.java:287)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)	at java.util.concurrent.FutureTask.run(FutureTask.java:137)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)	at java.lang.Thread.run(Thread.java:856)