Ziggy Marley learned the hard way -- sometimes charity hurts.
Bob's kid was playin' in a celebrity soccer match in L.A. Saturday, when he busted his knee so badly, he needed assistance to get off the field.
TMZ spoke with Marley's rep who told us, "He's walking around on crutches and has bandages on his knee."
Ziggy has a date with the doc this afternoon -- no word on what kind of medicinal products he's using to help with the pain.
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