What's the problem? (Warhammer: Vermintide 2)

GUID: 1791a48e-7505-41c1-8c58-8454557830f3
Log File:
Info Type:
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[Script Error]: ... extensions/default player unit/buffs/buff extension.lua:392: attempt to index local 'buff' (a nil value)
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[Crash Link]:
crashify://1791a48e-7505-41c1-8c58-8454557830f3