See #1273156: How to tell if Views cache is being rebuilt during views_exposed_form's hook_form_alter()? for an explanation. Whatever patch exists here is the most current suggestion. I say suggestion because Views development is a bit scattered. You might be using view-6.x-3.x, you might be using views-6.x-2.12, you might be using views-6.x-2.12 with the crazy security patch. So take a look at the patch, copy the few lines in it and place it where necessary for your version of views.

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#1 exposed_form_during_cache_rebuild-1286534-1.patch619 bytesR.J. Steinert

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new exposed_form_during_cache_rebuild-1286534-1.patch619 bytes

This patch is rolled from the the 6.x-2.12 tag with security patches.