PHP Notice 'yii\base\ErrorException' with message 'Undefined index: page' 

in /data/www/football/docs/engine.php:110

Stack trace:
#0 [internal function]: yii\base\ErrorHandler->handleError(8, 'Undefined index...', '/data/www/footb...', 110, Array)
#1 /data/www/yii/vendor/sentry/sentry/lib/Raven/Breadcrumbs/ErrorHandler.php(34): call_user_func(Array, 8, 'Undefined index...', '/data/www/footb...', 110, Array)
#2 [internal function]: Raven_Breadcrumbs_ErrorHandler->handleError(8, 'Undefined index...', '/data/www/footb...', 110, Array)
#3 /data/www/yii/vendor/sentry/sentry/lib/Raven/ErrorHandler.php(116): call_user_func(Array, 8, 'Undefined index...', '/data/www/footb...', 110, Array)
#4 /data/www/football/docs/engine.php(110): Raven_ErrorHandler->handleError(8, 'Undefined index...', '/data/www/footb...', 110, Array)
#5 {main}