I dunno, I think it would be normal for someone in Hannity's position to maintain contact with Manafort, from a professional perspective.
I'm not sure yet if Manafort was in custody or not at the time, though. If the former, then there's a problem there IMO.
He was recalled to prison on suspicion of attempted witness tampering, after all.
I don't listen to Hannity these days bc (1) he constantly interrupts even senior admin officials, not cool, and (2) he chases drama 24/7.