Sometimes, Saving SC_Data with invalid pointers

Originally posted by [b]zephyrus_cr[/b]
http://www.eathena.ws/board/index.php?autocom=bugtracker&showbug=3196

Sometimes, but not always, for example, i get this crash 3 months ago, and today again...

I received a Crash on map server with something about SC_DANCING or SC_GOSPEL and a invalid pointer to the skill_group.

Then, i checked the sc_data table on my database, and i found those 2 status saved on the list, on the characters that produced the crash on the server. Obviously when the status is loaded again, it receives too the pointer, as invalid, and when status changes ends, the server crash.

So, i report this bug because i was searching where in the code could this happen, but i havent found it.