When I insert an exoskeleton in an armor the game crashes with:

Exception at tick 8425: The mod Zoom Based Exoskeleton Speed (1.0.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event zoom-based-exoskeleton-speed::on_equipment_inserted (ID 185)
LuaItemStack API call when LuaItemStack was invalid for read.
stack traceback:
        [C]: in function '__index'
        __zoom-based-exoskeleton-speed__/control.lua:185: in function <__zoom-based-exoskeleton-speed__/control.lua:178>

You use any none standard equipment or gear mods?

Nope, apparently this happens in editor mode when inserting from the editor inventory into the armor in the character.

I cant recreate this, used editor and no crashes when insterting exoskeletons into armor.
Need more info.
What editor you using, list of mods etc.

Combination: Factorio 2.0.32 with Space Age, Elevated Rails and Quality
Mod: Scorpio_King's Zoom Based Exoskeleton Speed v1.0.2

Steps:
1. Create new game
2. Enter editor
3. Place a spidertron
4. Insert exoskeleton in the spidertron

I mentioned character because I was using Editor Extensions to enter the editor fast. With those steps you'll reproduce it.

Fixed.

Version: 1.0.3
Date: 07. 03. 2025
Fix:
- Added event.equipment.prototype null check before accessing type
- Enhanced player validity checks in loops
- Added grid existence check (armor.grid and)

Excellent.