Many thanks for your reply , so when should i apply to avoid the refusal

I’m a single parent with 2 kids 12 and 17 we have refugee settlement indefinite leave to remain from 09/10/2018 and we would like to apply for citizenship but I had a court penalty of misuse my mother’s blue badge on 28 /04/ 2018 , I don’t know if it will going to effect my situation as not good char ...