Macros and Dividing by 0

Everyone,  The following macro for Shadowrun 3rd ed works absolutely fine until the bold section ends up equaling 0.  /em @{selected|character_name} takes a hit! If the attack was M damage or higher @{selected|character_name}'s Ballistic Armor is reduced permanently by [[{floor(?{Power of the Weapon|0}/ @{selected|Armor-Ballistic} ),1}kh1]] due to Armor Degradation.  There is more to the macro, but I think this is what is breaking. I don't think Roll20 likes attributes being 0. Is there anyway to get this to work properly?

Well, it isn't that the attribute is 0 (or at least not in a general "attributes can't be 0" way). The problem is a basic math issue. You can't divide something by 0, so you just need to add another kh or kl around the attribute: {@{selected|Armor-Ballistic},1}kh1 I'm assuming that the attribute is 0 or greater here.

Thanks, Scott. Tried that but Roll20 didn't like it. Produced nothing. I think I'm going to just create a button called "No Armor" and have this: /em @{selected|character_name} takes a hit! Basically the Macro will then call out their body attribute and go from there. You are right, you can't divide by 0. The Armor Degradation reduces properly until it reaches 0 (no Armor). So, if I take the 0 out of the equation and I have them roll the "No Armor" macro it'll "fix" the issue.  Thanks again for you time, Scott.

If @{selected|Armor-Ballistic} contains a formula with dice instead of a number, you'd have to use the dice syntax for grouping: {@{selected|Armor-Ballistic}, 1d1 }kh1