Generals 1.05 crack works online, but
 

C&C: Generals v1.05 MP [ENGLISH] No-CD/Fixed EXE

That crack works in direct connect, but when you have played about 10-20 sec all your buildings will explode.I have tested it on orginal server and on my server and only the "cracked players" will explode.(Same like the first crack in RA2 :)

So could someone fix that?

It seems you've been messing with the serial key. Reinstall the game, and this time use the original unique cd key that came with your ORGINAL cd. The buildings exploding tends to happen when you change the cd key afterwards.