Why was Liverpool's Ibrahima Konate not sent off against Everton?

Why Liverpool's Ibrahima Konate wasn't sent off for a second bookable offence in the Premier League Merseyside derby against Everton.

Liverpool have been on the end of some spectacularly appalling refereeing decisions this season - giving a tragicomedy slant to the phrase: "Good process."
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Source : 90min