Asking for assistance in fixing incompatible plugins

I was working on my project and I found an incompatibility between Goinza’s Weapon Ranks and o-to’s command skills.
When both are in a project and a battle occurs, I get a crash.

Error: ExtraConfigBase.js
Line 238: ‘custom.tmpNowVirtualAttack.isSrc’ is null or not an objecct.

Because of the message I get when it crashes, I believe it to be something to do with the virtual attack being overwritten in a wrong way but I don’t know what sort of fix I’d need to apply.

Can I ask for any assistance in fixing this? What changes do I need to make to the plugins?