Illegal offset type

Hi, I use newrelic.com

I get this error in the newrelic. And my php load increases 10 times

Error message
E_WARNING: Illegal offset type

Sample stack trace

…daplus.biz/wp-content/plugins/buddypress/bp-activity/
bp-activity-functions.php (744)
…usb/pandaplus.biz/wp-content/plugins/buddypress/bp-blogs/
in bp_activity_post_type_get_tracking_arg called at /var/www/pandaplusb/pandaplus.biz/wp-content/plugins/buddypress/bp-blogs/bp-blogs-activity.php
bp-blogs-activity.php (909)
<strong>in bp_blogs_new_blog_comment_query_backpat called at ? (?)</strong>
…_func_array called at /var/www/pandaplusb/pandaplus.biz/wp-includes/
plugin.php (235)
…lusb/pandaplus.biz/wp-content/plugins/buddypress/bp-core/
bp-core-functions.php (278)
…ndaplus.biz/wp-content/plugins/buddypress/bp-activity/
bp-activity-template.php (304)
…iz/wp-content/plugins/buddypress-desktop-notification/
desktop-notification.php (156)
…iz/wp-content/plugins/buddypress-desktop-notification/
desktop-notification.php (55)
<strong>in dn_query called at ? (?)</strong>
…_func_array called at /var/www/pandaplusb/pandaplus.biz/wp-includes/
plugin.php (525)
… do_action called at /var/www/pandaplusb/pandaplus.biz/wp-admin/
admin-ajax.php (89)

https://www.ads-software.com/plugins/buddypress-desktop-notification/