Hi Armando,
I'm so sorry but I've to tell you that we cannot recover sprites from crash dumps :(
I've recovered .ase files before, but it was because some problems in the serialization of previous aseprite version. I'm really sorry.
The problem with crashes is that when you detect the crash signal, you cannot trust in the data (it is already corrupted). For example, in previous versions of ASE there was a auto-sessions save process in case of crash, but that was useless because the sprite was already corrupted. (I saw your crash dump, and the sprite had corrupted internal data of cel structure, so it's a bigger internal problem.)
I'll try to work on this issues for the next release.