If a question contains an impossible jump (for example to a previous question), or if an impossible condition has been set on a question (for example on the basis of a next question), this is indicated with a danger triangle. For instance:
Question 1: Which European cities have you been to?
This condition is disabled: Only show this question if the answer 'yes' is given to question 2.
In the example above, the condition on question 1 refers to question 2. This is not possible and is indicated in red. The condition is immediately disabled, but not removed. After correcting the condition, the question must be saved again.