Invalid condition: incorrect usage of function "length". in zabbix server trigger creation

Steps to reproduce:

1. Navigate to zabbix Triggers
2. Create a new trigger for a Item of type Text 
3. Pick Length Variable
4. Its missing the Of Type T Field and when clicking submit it throws the error "Invalid condition: incorrect usage of function "length"."

Result:
See screenshot...

Expected:
T should be there and should have values