Thanks a ton for the feedback! I'll look into this, but if you can provide more details, such as what level this was on and what you tried to do before getting onto the wall, it would help a lot!
Normally, you should be able to cancel your wall slide by pressing away from the wall or pressing down, as well as jumping, attacking or dashing in the direction away from it. So if you're stuck that's definitely a serious, yet rare problem, as it's the first I've heard of it, myself!