Crashes when adding a module on kovarex enrichment process

[BM123499]

Problem Description

factorio-current.log

It crashes the game when I click to add a module on the kovarex enrichment process using a centrifuge.

Reproduction

1. Added the mod into an existed gameplay.
2. Planned the following recipe requesting 60 uranium-235 and 60 uranium-238 per minute
3. Clicked on "add module" for the kovarex enrichment process.