Precondition:

The player character is infected with a common disease.

Description:

In the Ghost in a Gem quest (https://en.uesp.net/wiki/Tamriel_Rebuilt:Ghost_in_a_Gem), if the player chooses the Hastophos route while being infected with a common disease, there is a dialogue bug that occurs randomly and makes the quest impossible to complete. After the player provides Hastophos with ingredients and he does the ritual to summon Missa's spirit, the dialogue with the spirit continues as normal. After the spirit disappears, Hastophos initiates the dialogue with the player that is supposed to move the quest to another stage, but sometimes he uses the generic "hey you should go to a doctor" greeting instead. This happened 2 out of 3 times while testing. When you choose the "Missa Rhyle" topic, he reacts with a reply that is probably meant for another route in the quest.

When this bug happens, the quest can't be progressed any further with any of the dialogue topics that you can choose in dialogue with Valkreia Krex.