Always practicing slowly enough to stay in control is an ideal--a goal. But no matter how careful we are, mistakes will creep in as we attempt to push the limits of our ability. Increasing the tempo is the most common way that we stretch our abilities to the point of making mistakes. Be careful not to practice too fast too soon.
That being said, if and when a mistake creeps in during practice, do not stop on it!! Interrupting that flow would strengthen the bad habit of stopping or pausing for mistakes.
Instead, keep going with whatever rhythmic flow you have established. Play (survive, improvise) through it, making a simple mental note of its location and nature. Stop at a point of your choosing, and then return to the problem spot and deal with it appropriately.