Issue has been introduced by story #11261.

Trace:
Fatal error: Call to a member function quoteSmart() on null in /usr/share/tuleap/plugins/git/include/GitLog.class.php on line 131
Call Stack
# Time Memory Function Location
1 0.0008 244136 {main}( ) ../source_code_access.php:0
2 0.1203 9646712 plugins_logs_daily( ) ../source_code_access.php:162
3 0.1203 9646784 plugins_log_extract( ) ../source_code_access_utils.php:475
4 0.1204 9647744 EventManager->processEvent( ) ../source_code_access_utils.php:468
5 0.1814 10768104 EventManager->processEventOnListener( ) ../EventManager.class.php:94
6 0.1814 10768104 PluginProxy->processEvent( ) ../EventManager.class.php:106
7 0.1814 10768200 GitPlugin->logsDaily( ) ../PluginProxy.php:64
8 0.2208 11504856 Git->logsDaily( ) ../gitPlugin.class.php:1303
9 0.2219 11516408 GitLog->logsDaily( ) ../Git.class.php:1514
10 0.2219 11516472 GitLog->getGitReadLogFilter( ) ../GitLog.class.php:52
11 0.2219 11517000 GitLog->getDateFilter( ) ../GitLog.class.php:102