Undefined Index error whenI run SYBUNT report
that's just a notice - it's annoying - but may not be critical. You can check civicrm JIRA https://issues.civicrm.org/jira/projects/CRM/issues to see if there is an issue for it/report it (if not already). 

If this is a live site then it's recommended not to display any errors. On Drupal go here:

admin/config/development/logging


and set to None.