I do not have square on poisons, what to do? I go to the NPC which berёrsya quest but he opened it dealog it is empty, there is nothing, no job and no dialogue, what to do?

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I do not have square on poisons, what to do? I go to the NPC which berёrsya quest but he opened it dealog it is empty, there is nothing, no job and no dialogue, what to do?