Seller Agent trying to avoid paying buyer agent commission

[Ravilla Roshini]

I’m buying a house, as the closing disclosure was sent to me, I saw the buyer agents commission is set as Zero. The seller agent slipped Zero into the initial contract under disclosure section on page 10. There was no agreement signed by my agent on the Commission. 
The listing has 3% on MLS. My agent is an MLS participant and has ABOR membership.
what’s best course of action? My buyer agent would be covering most of my closing cost through agent credits, as he is a friend of ours. 

PS: the seller agent says the seller accepted the offer as buyer agent fee is zero. We never communicated about zero commission, only found it through closing disclosure.