Causal Fallacy is a logical fallacy in which a person presents an incorrect cause. 

Stan: I think one of the reasons why my project is failing is that I started it in the summer. Everytime I start doing something serious in the summer I end up failing.

Mary: I don't think that this fact had any impact on the outcome. There's a number of objective factors that contributed to the outcome.

Full dialogue here: All argumentation fallacies

Video example: