FaceApp’s founder Yaroslav Goncharov has apologized for its “hot” filter after some users pointed out it made their skin appear lighter, The Guardian reports. The selfie app uses neural networks to change a person’s appearance by plastering a fake smile onto their face or making them look older or younger. But the app’s hot filter seemingly just makes people look whiter.

“We are deeply sorry for this unquestionably serious issue,” Goncharov said, according to The Guardian. “It is an unfortunate side-effect of the underlying neural network caused by the training set bias, not intended behavior.”

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