I get the following error [https://i.imgur.com/i7KO4R5.png] when loading up the game with space-exploration_0.6.111 and not space-exploration_0.6.108. With SE 0.6.108 the boots up as normal, and I can load saves normally.

Can you post the log file?

Here is the Pastebin https://pastebin.com/W6AvENtT

Many Thanks.

Could you get a minimal reproduction modlist? Disable half of your modlist, see if the issue happens, it yes, disable half of the leftover, rinse and repeat

Looking into the code, it looks like it's more likely to be an issue with the stacking mod trying to stack an item with no subgroup set. Since it lists my mod as the cause, it means some other mod removed the subgroup of an item I'm stacking, most likely.

I found that just removing the mod YARM and keeping everything else would fix the error and nothing seems to have gone wrong yet. However, with some more testing, it seems that having a bare bones mod list and adding YARM also boots up to the main menu so that doesn't seem to be the root cause.

It looks like YARM adds dummy ores, whose icons are used by its selection tool. Adding any valid subgroup to them fixes the issue, but I'm not sure why this mod is trying to stack them in the first place.

local ore_items = {}

for name, proto in pairs(data.raw.resource) do
    ore_items[#ore_items + 1] = {
        type = 'item',
        stack_size = 1,
        flags = { 'hidden' },

        name = 'YARM-fake-' .. proto.name,
        icon = proto.icon or nil,
        icons = proto.icons or nil,
        icon_size = proto.icon_size or nil,

        place_result = proto.name,
    }
end

data:extend(ore_items)

It looks like YARM adds dummy ores, whose icons are used by its selection tool. Adding any valid subgroup to them fixes the issue, but I'm not sure why this mod is trying to stack them in the first place.

```
local ore_items = {}

for name, proto in pairs(data.raw.resource) do
ore_items[#ore_items + 1] = {
type = 'item',
stack_size = 1,
flags = { 'hidden' },

    name = 'YARM-fake-' .. proto.name,
    icon = proto.icon or nil,
    icons = proto.icons or nil,
    icon_size = proto.icon_size or nil,

    place_result = proto.name,
}

end

data:extend(ore_items)
```
Hey gaxlr, what exactly have you added here?

Sorry, missed the notification here. Adding subgroup = 'raw-resource' would do it, as would just commenting out the data:extend (doesn't affect much).

That said, the issue is fixed as of today via Stacked_Mining 1.2.4, which was apparently the mod triggering stacking of the fake ores:

    - Added a check to only try to stack resources if there is a valid prototype