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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806) at java.util.HashMap$ValueIterator.next(HashMap.java:838) at com.parse.ParseTraverser.traverseInternal(ParseTraverser.java:87) at com.parse.ParseTraverser.traverse(ParseTraverser.java:137) at com.parse.ParseObject.collectFetchedObjects(ParseObject.java:817) at com.parse.ParseObject.access$700(ParseObject.java:49) at com.parse.ParseObject$13.then(ParseObject.java:1487) at com.parse.ParseObject$13.then(ParseObject.java:1484) at bolts.Task$15.run(Task.java:917) at bolts.BoltsExecutors$ImmediateExecutor.execute(BoltsExecutors.java:105) at bolts.Task.completeAfterTask(Task.java:908) at bolts.Task.continueWithTask(Task.java:715)