64-bit Win10 here, it's been happening since I updated to 1.4 (could have been 1.3 causing it, though - I skipped a version). I find that sometimes the crash will fail to occur if some or all of the following conditions are met:
1. There aren't a lot of people in the server.
2. There has only been a fairly low amount of rounds played, and/or the map being played is a very small one.
A notable instance of what I just described occurred in an FA server in 1.4.2. After a few rounds in SaBH, my younger brother (who doesn't experience this, using the Steam client rather than OpenJK) and I switched to CMP_Vengeance for a few more rounds when another player joined. We played maybe one or two rounds in the DotF duel, and I think I crashed on the next map change, assuming I hadn't left already.
There have also been instances where the crash will occur without a map change. Apparent causes are as follows:
1. There's a lot of people in the server.
2. A lot of rounds (20+, by my estimates) have elapsed since I joined.
3(?). The map is a decently-sized one - my tendency to stick to DotF servers because they don't change maps hasn't completely averted the issue, but it has certainly mitigated it by a substantial margin.