Mod crashes if server has caves

[falk_]

Why are some mods incompatible with servers with caves?

I am specifically looking at the "Additional Equipment (DST)" mod. Here is the link to it: http://steamcommunity.com/sharedfiles/filedetails/?id=681368916

The mod works perfectly fine, as long as the server does not have caves.

If the server has caves, then the backpack items of the mod will crash. The error says something related to the container:Open and a nil value.

Is there any way to fix this and make it compatible with caves?