Does it only crash during export or while scrubbing through to 9000 frames as well? Are you using “export” and “render” interchangeably here, because they are 2 different things…you can search the forums for an explanation – though I can’t recall the particulars I believe Dave LaRonde has posted in the past on the differences between the two.
I would try accessing the secret area of your preferences and purging every X frames (where X is a number of your choice). To do so, hold down shift and navigate to the “preferences” folder from your menu – if you’ve done it right, the last option in the preferences dropdown should be “secret”.
From here you can tell AE to purge every X frames during a render. This has helped me overcome crashes in the past. The downside is that your render time will increase if you are using time-based effects as they use previous frames to calculate how they’ll be applied to the frames ahead.
Hope this helps