Uncaught query monitor error on WP Crontrol

[kevinlisota]

We use both Query Monitor and WP Crontrol on our site. There is a specific cron event in Tools > Cron Events that triggers a fatal error in Query Monitor, preventing the rendering of the remaining cron events.

Uncaught Error: strpos(): Argument #1 ($haystack) must be of type string, null given
in /home/1114090.cloudwaysapps.com/fncvwrznat/public_html/wp-content/plugins/query-monitor/output/Html.php on line 505

Call stack:

strpos()
QM_Output_Html::output_filename()
Crontrol\output_callback()
Crontrol\Event\Table::column_crontrol_actions()
WP_List_Table::single_row_columns()
Crontrol\Event\Table::single_row()
WP_List_Table::display_rows()
WP_List_Table::display_rows_or_placeholder()
WP_List_Table::display()
Crontrol\admin_manage_page()
WP_Hook::apply_filters()
WP_Hook::do_action()
do_action()
require_once('/home/1114090.cloudw...l/wp-admin/admin.php')

Right now, the error is specific to this cron event is from Gravity Forms SMTP plugin: gravitysmtp_cron_gravitysmtp_email_summary

I haven't taken the time to debug this. It could be an issue with the Gravity Forms SMTP cron job or something in WP Crontrol, but I think Query Monitor should probably fail gracefully.