Unexpected error occurred please report to forums [0.18.21] Seablock

[Jemsterr]

Emptied inventory except robots (pinned to bottom right slot). Ctrl-clicked a stack of crystal dust inside a warehouse to collect an inventory full of crystal dust, game froze, then the "An unexpected error occurred" dialog appeared which requested that I report it to the forums.

Most recent autosave also attached, just in case that helps.

[Jemsterr]

After loading the autosave, and looking around, I have found that there are 2 transport drones collecting crystal dust from a provider (I had only recently placed the requester, this is their first collection).

I have created a savefile close to the moment of the crash. The first drone is able to collect a stack of crystal dust without issue, but the moment the second one collects and is about to head off (trying to pathfind?) the game crashes.

The crash does not happen if you mine the provider before the drones arrive to collect the crystal dust.

All mods are up-to-date versions, but I can attach a zip of the mod folder if needed.