If you have the Separate Sticky and Normal Threads product installed there's an incompatibility between it and stock vbulletin code (particularly the vbulletin-core.js file) where stock vbulletin is not checking if a variable is not null before trying to do stuff with it, which causes the error you're seeing. If you look in the thread I've got a fix posted for editing the vbulletin-core.js file and there's another fix listed there as well. Others have moved to other mods for separating stickies and non-stickies.
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