If your Image Sync is crashing due to  the error message List has more than 1 row for assignment to SObject, here is what you can do:

1. Verify if you have SharinPix Image Sync settings for the same Salesforce object. If that's the case, delete the extra setting as SharinPix requires only one Image Sync setting per object.
2. Verify if any two or more SharinPix Image Sync settings have the same object API name in the Parent Object Name field. If that is the case, this means that the such Image Sync settings belong to the same object. Delete the extra settings as SharinPix requires only one Image Sync setting per object.