applidium/ADClusterMapView — pull request #3 by danpizz (2012-11-08 15:13:00+00:00)
Title: Fix crash (call to not existent shouldBeRemovedAfterAnimation method)

If an annotation is not a MKUserLocation it could possibly be different from MKUserLocation.

It happened to me, Apple seems to have custom private annotations that are not children of MKUserLocation.