Generally speakeing, what are good ways to prevent crashes?

#1
Had one at the end of this video

[youtube]4h8Ka5W9RuY[/youtube]

Had a memory access violation, first one of those I have had in quite a long time since 0.8.1 came out. PLayed the custom map that came with teh game so yeah, what are ways to minimise the risk of CTD's?
[youtube]UiiFYiX_EYM[/youtube]
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