Division by ZERO on a Zabbix 5.4 calculated item

[martinpedros]

Hi Team:

I am generating a calculated item in Zabbix 5.4 with the following expression:

100-(last(//SwapFree)/last(//SwapTotal))

The problem is when the swap memory is equal to zero (SwapTotal = 0). I try to solve it with the following expression:

100-(last(//SwapFree)/last(//SwapTotal)+ count("SwapTotal",#1,0))

... but I get the following error when I want to save:

Invalid parameter "/1/params": incorrect expression starting from "count("SwapTotal",#1,0))"

Could someone guide me on how to solve this division by zero?

Thanks in advance.

Martin Pedros