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Ok, in fact, I've found a solution by myself.
The map was 130x130, with nothing weird on it, nothing visible just the save crash.
The solution is to use rev 620 to copy my entire map to a 131x131 map and saving. After that, I've open the map with rev 586, clean lightmaps and save.
Since I've do that, no problem, so it's solved!
I hope this solution can help someone else.
Thanks for your help.
