Sync profile error messages

Hi

We have had a sync profile running on a schedule with the following error messages logged 

1 -Error initializing SyncReport tables during step 3

2- Exception in ProcessGroups on object (SQL ID: 142307)

The profile has completed we had had another sync profile record the second error message about the exception in processgroups

We have 10 sync profiles for groups running an the rest have recorded no issues

We found a Quest knowledge article about the processgroups issue pointing at custom attributes which we don't have in mapped fields 

Any ideas at what to look at?