Undefined array key warnings when entering a report page
When a report page is accessed several warnings appear in watchdog. For example the path of one of the reports is /civicrm/report/instance/3, the warnings are:
Warning: Undefined array key "batch_id_op" in include() (Zeile 42 in sites\default\files\private\civicrm\templates_c\en_US\%%E0\E0C\E0C36992%%Filters.tpl.php)
Warning: Trying to access array offset on value of type null in include() (Zeile 42 in sites\default\files\private\civicrm\templates_c\en_US\%%E0\E0C\E0C36992%%Filters.tpl.php)
Warning: Undefined array key "type" in include() (Zeile 48 in sites\default\files\private\civicrm\templates_c\en_US\%%1B\1BD\1BD7DE8F%%Statistics.tpl.php)
Warning: Undefined array key "type" in include() (Zeile 51 in sites\default\files\private\civicrm\templates_c\en_US\%%1B\1BD\1BD7DE8F%%Statistics.tpl.php)