# CiviCRM 5.9.1
Released January 16, 2018
- **[Synopsis](#synopsis)**
- **[Bugs resolved](#bugs)**
- **[Credits](#credits)**
- **[Feedback](#feedback)**
## Synopsis
| *Does this version...?* | |
|:--------------------------------------------------------------- |:-------:|
| Fix security vulnerabilities? | no |
| **Change the database schema?** | **yes** |
| Alter the API? | no |
| Require attention to configuration options? | no |
| Fix problems installing or upgrading to a previous version? | no |
| Introduce features? | no |
| **Fix bugs?** | **yes** |
## Bugs resolved
- **[dev/core#660](https://lab.civicrm.org/dev/core/issues/660) Fatal DB Error:
already exists on event registration/contribution pages when profile has user
creation ([Backport
13451](https://github.com/civicrm/civicrm-core/pull/13451))**
In CiviContribute and CiviEvent, this fixes a crash on the payment page
affecting anonymous users in certain ACL configurations. The change relaxes a
foreign-key constraint.
- **Fix broken case activity date filter #13449
([Backport 13449](https://github.com/civicrm/civicrm-core/pull/13449))**
## Credits
This release was developed by the following authors and reviewers:
Wikimedia Foundation - Eileen McNaughton; Nicol Wistreich; CiviCRM - Tim
Otten, Coleman Watts; Circle Interactive - Dave Jenkins; Australian Greens -
Seamus Lee
## Feedback
These release notes are edited by Tim Otten and Andrew Hunt. If you'd like to
provide feedback on them, please login to https://chat.civicrm.org/civicrm and
contact `@agh1`.