If the contact information is not on your ERP system, at the time of the sync, empty accounts are dragged out. To prevent this from happening, use the "Use YayPay as the system of record for contacts" checkbox to allow you to save the contact information. 

1. To find this checkbox you need to go to Settings > Business account 

2.  Scroll down to find the checkbox “Use YayPay as the system of record for contacts” and tick it. 

3. Scroll down and SAVE changes.