Steps to reproduce:

1. Create simple item with trigger
2. Create webhook type action operation (Administration > Scripts > Create script) with simple Java script script e.g:

   1. try {
        var params = JSON.parse(value);  params.test_param_test = "_" + params.test_param;  Zabbix.log(3, JSON.stringify(params));
      } catch (error) {
        Zabbix.log(3, error);
      }
      Zabbix.log(3, "End of Script");
      

1. Create action in Configuration > Actions and link created before trigger
2. Wait for a problem

Result:
See screenshot name "Error.jpg"

Action log result is failed - "cannot execute script (null)", but it's executed properly

Expected:

Action log should be "Successful"