The "500" error appears when user uses import single record

Overview: Import single record failed with "Something went wrong" error.
The issue is reproduced not each time.
Steps to Reproduce:

1. Log into Nolana BF FOLIO environment as User with following permissions:
   Inventory: All permissions
   Inventory: Import single bibliographic records
   quickMARC: View, edit MARC bibliographic record

2. Go to "Inventory" app.

3. Click on the "Actions" >> "Import".

4. Select "OCLC WorldCat" in the first dropdwon.

5. Enter the valid "OCLC Number" value (for exmaple: "855491594")

6. Click on the "Import" button

Expected Results: The new "Instance" record successfully imported.
Actual Results: 
1) From UI side: the error toast notifcation is being displayed with the following message: "Something went wrong: HTTPError: 400: Add record for job execution failed: POST http://pvt.lb.nbf.folio-eis.us-west-2:9130/change-manager/jobExecutions/667e8d20-3e37-4d82-b955-e475b70424fa/records returned 500 (expected 204):Internal Server Error, Please contact System Administrator or try again" 
2) From Back-end side:  the POST request to the "/copycat/imports" failed with the following error message: "Add record for job execution failed: POST http://pvt.lb.nbf.folio-eis.us-west-2:9130/change-manager/jobExecutions/667e8d20-3e37-4d82-b955-e475b70424fa/records returned 500 (expected 204):Internal Server Error, Please contact System Administrator or try again"
Additional Information: see attached screenshots.
Interested parties: