Bug Description:
Game crashes after putting more than 9 items in horse inventory.
When shift right click a horse(that has saddlebags) while dismounted you see the 3x3 item grid (9 slots)
But while mounted and opening your inventory (Pressing E by default) you see 5x3 (15 slots). Trying to full all the slots, or over 9 of them, causes a game crash with the error code " -1 "
Mod Version:
1.5 (I first found it here) and 1.6 (newest version still has it)
Minecraft Version:
1.20.1
Screenshot (Optional):


Have you tried removing other mods? Did the issue persist after removing them?:
Yes. Tested with only Livestock mod and still got the same results.
Are you on Singleplayer or a Server?:
Both have been tested and still crashes

No in both versions the horses where originally from that version to start. I did try for the sake of trying shearing the chest off a horse in the 1.6 version and after reputing it on I was still able to crash the game with the same actions.

Was this horse spawned in before 1.5 or 1.6 by chance, or is it newly-spawned after updating?

If it's an older horse, try shearing off the chests and putting them back on.
Otherwise, just let me know and I'll take a look

Ah okay, thanks for trying anyway.

I'll take a look

Wait, what's up with your breed text? LOL

I'll take a look at that too while I'm at I suppose

LOL it's been like that for me even in 1.5 (the version i first started playing of the mod) so i thought it was normal XD

Made me curious and I went to testing cause i havent had a chest on any of my horses yet. I started a new game with the latest update and have some horses there, so they are not from 1.5 or before.
When riding the inventory is 15 slots, when i open the inventory with shift-click from the ground it has only 9 slots. I cannot make my game crash with overfilling it tho. Its just as if it is cut-off in the interface, but i cannot access the items in the last 6 slots unless opening the inventory while riding.

Heres the video. I try shift clicking items in until they stop doing into the horses inventory. Then I click and drag a item (note the horse already has 9 items so im adding a 10th) into a open slot, at which the game crashes (video ends because of this)

(i forgot i was going to add this also for the sakes of extra infos)
Pictures showing in detail what versions I am using in the video (tho as i mentioned I have found it in other versions/settings)

I know what the issue is caused by and will be attempting to fix it soon, please be patient with me!

Yeah okay, with trying to drag an item in I can get mine to crash as well. I usually only shift click. Interestingly enough tho mine fills the 15 slot inventory with shift click up. Only the dragging doesnt seem to work for me on those slots.

No worries and no rush! Happy to helps!