Cannot read property 'group' of undefined

[ksycoltd]

Describe the bug
Problems panel doesn't work. It shows "Cannot read property 'group' of undefined".

** Log **
TypeError: Cannot read property 'group' of undefined
at eval (triggers_panel_ctrl.js:253)
at angular.js:17169
at angular.js:17217
at c.$digest (angular.js:18351)
at c.$apply (angular.js:18649)
at angular.js:20574
at p (angular.js:6428)
at angular.js:6707 "Possibly unhandled rejection: {}"

Software versions

Grafana	Zabbix	Grafana-Zabbix Plugin
6.5.1	4.4.3	3.10.4

[alexanderzobnin]

duplicates #817