Unexisting domain/fallback?

[MatSemCVMaker]

I'm currently using the gatsby-source-trustpilot to show some reviews in a multi-domain website.

The main gatsby-config is shared for all builds in various domains, so i get the domain of the website as a variable and pass it in the arrays of domains i gatsby-source-trustpilot options with a main domain that i expected to use as a fallback. Unfortunately, not always the domain exist (as example dev enviroments or new domains), and this break the plugin

"gatsby-source-trustpilot" threw an error while running the sourceNodes
lifecycle:

404 - [object Object]

  44 |                         // Get Business Unit IDs for given domains
  45 |                         _context.next = 5;
> 46 |                         return client.fetchUnitIdsForDomains();
     |                                       ^
  47 |
  48 |                     case 5:
  49 |

is there a way to implement some kind of fallback?