I always get nil from this table, can you find my mistake?

To explain what's going on, I'll briefly explain how tables work in Lua.

Lua tables have two parts to them: a hash part and an array part. The array part contains the values of the table that are indexed using positive integers (1, 2, 3, etc.). The other part is the hash part, which can be indexed using any Lua value other than nil. Most commonly, strings are used for indexing it, but they could also be userdata or tables.

In your case, you're writing to the hash part of the table, but you're trying to find the values from the array part. v.Name is a string, so it goes the hash part, while keybinds[1] tries to index the array part. Instead, to check whether a table contains any values, including both the hash and array parts, you can use next, like so:

print(next(keybinds)) --> prints `nil` if and only if the table keybinds is empty

Side note: next is an iterator function, often used for going through tables in for loops. The two following loops are actually functionally equivalent!

    for i,v in pairs(KB:GetChildren()) do
        keybinds[v.Name] = v.Value
    end

    do
        local tab = KB:GetChildren()
        local i, v = next(tab)
        while i ~= nil do
            keybinds[v.Name] = v.Value
        end
    end

Edit: Changed "numerical part" to "array part".

Could it be that on line 5, where you try to rename the children in the "keybinds" table it doesn't work because the keybinds table contains no children? I mean, it would make sense since you try to print the first child of the table but you never added any child into the table. Hence it returns nil. On line 5 You try to set the property of nothing to a string.

Maybe, I'm really not sure.

Thanks for your help everyone, but i'm just fricking blind!!! well, it already would've worked if i wasn't dumb enough to mess up the loading part of it. Big Thanks anyway to you guys.