Board Thread:Off Topic/@comment-98.114.218.229-20150213213730

I have a quest from the companions to kill any creature/enemy in the passage. I've already killed everything in there prior to starting the quest, so the only thing left in the passage is a floating quest marker over nothing. This might be similar to other quest glitches involving retrieving items that you already have. I can't progress with any companion quest until this is done. Is there any command I can type into console to fix this? 