Ignoring errors is the opposite of error correction; that is letting errors go as usually as long as meaning is not affected.
Ignoring an error is only technically possible after one has first detected one.
This is the approach taken by most native speakers when they are engaged in actual real life conversation with proficiency-lacking non-native speakers. Advocated in The Natural Approach.
Teachers may also choose to ignore errors in the classroom if error correction is somehow unhelpful. This strategy may be particularly effective with young learners.