More likely the name of the faulting module was unable to be obtained.
So the string buffer just showed random stuff.
As for BEX64, that's just an event name. Not anything to do with Blue Tube stuff.
64 for 64-bit. On 32 it'd just be BEX. Just doing an export could still exercise plugins.
So, it's not immediately apparent what module the fault is in. You can try performing the export while in safe mode which would rule out the plugins. If that's fine, then one way to track down which one's causing it is to do a classic binary search algorithm where you divide things up and say archive 1/2 the tracks and continue searching in the 1/2 that still crashes and so on until you find which plugin is causing trouble.