When creating or editing groups in USM, you apply a filter. The below error occurs. The portal.log also displays the same stack trace that only includes the NullPointerException.
A data issue in the umpGeoView table can cause this. There will be some unexpected element in the "def" field for which parser is giving error. Either the value of def in null or something that is not recognize by the parser.
Release : 8.51
Component : UIM - UMP_USM
You can resolve the issue by
1. Identifying the record with an unexpected value in the 'def' field
2. Deleting that record or GeoView and recreating it