Godot just crashes after generating a procedural dungeon | Godot Engine | Page 1

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I have a code that works and one that doesn't but the thing is. Whenever I add something to the code it just crashes the engine with no error or anything. Engine just crashes.

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Here is how it works:
I have a grid map that is filled with some cubes. These cubes are going to be my sketchup for the dungeon itself

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But I need to generate them first, before moving to the dungeon

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Wheneven I click the button to create it, the engine just closes without any popup or any error mensage

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The code that works:

@tool
extends Node3D

@export var start : bool = false : set = set_start
@export var border_size : int = 20 : set = set_border_size

@export var min_room_size : int = 2
@export var max_room_size : int = 8
@export var room_margin : int = 1

@export var number_of_rooms : int = 4

@onready var grid_map: GridMap = $GridMap

func set_start(set: bool)->void:
    generate()

func set_border_size(val : int)->void:
    border_size = val
    if Engine.is_editor_hint(): #checks if is in the editor or in the game itself
        visualize_border()

func visualize_border(): # shows the border of dungeon
    
    print("Showing borders, current border size is: ", border_size)
    grid_map.clear() #clears the meshes before showing, this prevents to paint on top of the new border visualization, comment this line to understand what does it does
    for i in range(-1, border_size+1): # draws the borders
        grid_map.set_cell_item(Vector3i(i, 0, -1),3) # draws in X axis
        grid_map.set_cell_item(Vector3i(i,0,border_size),3) # in Y axis
        grid_map.set_cell_item(Vector3i(border_size,0,i),3) # in X axis
        grid_map.set_cell_item(Vector3i(-1, 0, i),3) # in Y axis, put a negative number to understand whats going on here

func make_room():
    
    var width : int = (randi() % (max_room_size - min_room_size)) + min_room_size
    var height : int = (randi() % (max_room_size - min_room_size)) + min_room_size
    
    var start_pos : Vector3i
    start_pos.x = randi() % (border_size - width + 1)
    start_pos.z = randi() % (border_size - height + 1)
    
    for row in height:
        for column in width:
            var pos : Vector3i = start_pos + Vector3i(column, 0, row)
            grid_map.set_cell_item(pos, 0)
    
func generate():
    print("Generating. . .")
    visualize_border()
    for i in number_of_rooms:
        make_room()

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And the one that doesnt

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htt ps://copy-pa ste.onl ine/?code=9009

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I've been struggling with this for a few days now, any idea?

#Godot just crashes after generating a procedural dungeon