Don't write off Jon "Bones" Jones just yet ... so says UFC legend Chuck Liddell who tells TMZ Sports the light heavyweight champ is a "good guy" who simply made a mistake.
Jones checked in (and then out) of a rehab facility last week after testing positive for cocaine following UFC 182 ... but The Iceman says Jon will beat this problem like he beats everything else.
"He's gonna be fine, trust me," Liddell said while heading into Katsuya in Hollywood ... "He made a mistake. Give the guy a break."
Liddell says he hasn't spoken with Jones yet ... but plans to have a conversation with the fighter soon.