Generally speaking Staff cannot be a guarantor. Bug 36169 asks to add the ability to allow staff to be a guarantor. Currently it is not possible to add a guarantee from a staff account. However, it is still possible to add a staff guarantor from a guarantee account. Either this should be disabled or a warning provided. To replicate: 1. Find a staff account to have ready. 2. Find another non-staff patron account - ensure the patron category can be a guarantee. 3. Edit the patron account. 4. Under the section for Patron Guarantor - Add guarantor. 5. Search for the staff account and select. 6. Save the patron record. 7. Pull up the staff account and see they are now a guarantor.