Duì zìjǐ de cuòwù bì ér bù tán shì bù fù zérèn de.
Dodging one's own mistakes is irresponsible.
Tips
usage
Carries mild criticism — implies the speaker has something to hide or isn't being fully transparent. Not neutral. Compare with 闭口不谈 (stronger, 'seal one's lips and say nothing').
grammar
Usually takes an object via 对 or 关于: 对...避而不谈 / 关于...避而不谈. Can also appear bare, with the topic implied from context.