[03-Oct-2018 15:45:31] WARNING: [pool tuleap] child 22197 said into stderr: "NOTICE: PHP message: PHP Fatal error: Call to a member function getId() on null in /usr/share/tuleap/plugins/cardwall/include/OnTop/Config/ColumnFactory.class.php on line 103"
To reproduce the issue:
Switch the artifact status to "pending".
Go to tracker field administration, and mark "pending" value as hidden.
Go to tracker report, search for status=pending, and display a cardwall renderer on the status field.