Products Not Syncing with Easyship App

[cherylfoh]

Our products are all of a sudden not syncing with the Easyship app, and we've been experiencing this issue for about a week now. I contacted Easyship directly to check if the problem was on their end, but they informed me that it is a Shopify-related issue and advised me to reach out to Shopify for further support. According to Easyship, this is the error message they retrieved while testing the sync on their end. Please see the error message below.  

 "ERROR: ON CONFLICT DO UPDATE command cannot affect row a second time. HINT: Ensure that no rows proposed for insertion within the same command have duplicate constrained values." 

Any help is appreciated. Thank you.