Python error when trying to destroy an object in Ursina

Question

I'm pretty new to coding in python but I have started a small little script. Its a first person shooter and right now I'm working on ammo boxes you can pick up. This is the code:

from ursina import *
from random import uniform
from ursina.shaders import lit_with_shadows_shader
from ursina.prefabs.first_person_controller import FirstPersonController

app = Ursina()
Entity.default_shader = lit_with_shadows_shader
player = FirstPersonController(model='cube', color=color.orange, origin_y=-.5, speed=8, position = (-52, 0, 57))
player.collider = BoxCollider(player, Vec3(0,1,0))
player.visible = False
ammo = 10
editor_camera = EditorCamera(enabled=False, ignore_paused=True)           
ammoCounter = Text(text= ammo + ammo, position = (-0.4,-0.4), color = color.black)

def update():
    ammoCounter.text = ammo 
def pause_input(key):
    if key == 'tab':    # press tab to toggle edit/play mode
        editor_camera.position = player.position 
        editor_camera.rotation = (90,180,0)
        editor_camera.y = 50
        editor_camera.enabled = not editor_camera.enabled
        player.visible =True
        player.visible_self = editor_camera.enabled
        player.cursor.enabled = not editor_camera.enabled
        gun.enabled = not editor_camera.enabled
        mouse.locked = not editor_camera.enabled
        application.paused = editor_camera.enabled
pause_handler = Entity(ignore_paused=True, input=pause_input)
    

def input(key):
    global ammo 
    
    
    
    ## destroy ammo crates##
    if key == 'e':
        if mouse.hovered_entity == ammo1: 
            if distance(player, ammo1) <= 5: 
                ammo += 10
                destroy(ammo1)
        if mouse.hovered_entity == ammo2: 
            if distance(player, ammo2) <= 5:
                ammo += 10
                destroy(ammo2)
        if mouse.hovered_entity == ammo3: 
            if distance(player, ammo3) <= 5:
                ammo += 10
                destroy(ammo3)
        if mouse.hovered_entity == ammo4: 
            if distance(player, ammo4) <= 5:
                ammo += 10
                destroy(ammo4)
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

   
    if key == 'k':
        print (player.position)
        print (ammo)

    if key=="left mouse down" and ammo > 0:
        ammo -= 1
        if mouse.hovered_entity and hasattr(mouse.hovered_entity, 'hp'):
            mouse.hovered_entity.hp -= 10
            mouse.hovered_entity.blink(color.red)
            print (ammo)
        Audio("gunshot")
        if gun.position == (0.45,-0.2,0):
            Animation("spark", parent=camera.ui, fps=5, scale=.15, position=(0.28, -0.01), loop=False)
            print (ammo)
        if gun.position == (0,-0.15,0):
            Animation("spark", parent=camera.ui, fps=5, scale=.15, position=(-0.005,0.08,0), loop=False)
            print (ammo)
        
    if held_keys["q"]:
            gun.position = (0,-0.15,0)
            gun.rotation = (0,0,0)
            Cursor = False
            player.speed = 1
            if held_keys["shift"]:
                player.speed = 100
            
    else: 
        gun.position = (0.45,-0.2,0)
        gun.rotation = (5,30,0)
        player.speed = 250 * time.dt
    if held_keys["shift"]:
        player.speed = 400 * time.dt
        

            


        
        
## ammo refill class#

class AmmoR(Entity):
    def __init__(self, **kwargs):
        super().__init__(model='cube', texture = 'ammobox', scale = 1, origin_y=-0.5, collider = "mesh", **kwargs)

## amount of amo refill boxes##

ammo1 = AmmoR() 
ammo2 = AmmoR()
ammo3 = AmmoR()
ammo4 = AmmoR()
ammo1.position = (-9,2,53)
ammo2.position = (50,1,21)
ammo3.position = (-17,0,31)
ammo4.position = (15,0,8)


class Enemy(Entity):
    def __init__(self, **kwargs):
        super().__init__(model='cube', scale_y=2, origin_y=-0.5, color=color.light_gray, collider='box', **kwargs)
        self.health_bar = Entity(parent=self, y=1.2, model='cube', color=color.red, world_scale=(1.5,.1,.1))
        self.max_hp = 100
        self.hp = self.max_hp

    def update(self):
        dist = distance_xz(player.position, self.position)
        if dist > 40:
            return

        self.health_bar.alpha = max(0, self.health_bar.alpha - time.dt)


        self.look_at_2d(player.position, 'y')
        hit_info = raycast(self.world_position + Vec3(0,1,0), self.forward, 30, ignore=(self,))
        if hit_info.entity == player:
            if dist > 1:
                self.position += self.forward * time.dt * 5

    @property
    def hp(self):
        return self._hp

    @hp.setter
    def hp(self, value):
        self._hp = value
        if value <= 0:
            destroy(self)
            return

        self.health_bar.world_scale_x = self.hp / self.max_hp * 1.5
        self.health_bar.alpha = 1

## ENEMYS FIRST LEVEL
enemie1 = Enemy()
enemie2 = Enemy()
enemie3 = Enemy()
enemie4 = Enemy()
enemie5 = Enemy()
enemie6 = Enemy()
enemie7 = Enemy()
enemie8 = Enemy()
enemie9 = Enemy()
enemie10 = Enemy()
enemie11 = Enemy()

enemie1.position = (10,0,-2)
enemie2.position = (51.9096, 0, -57.6378)
enemie3.position = (53.7879, 0, -57.4827)
enemie4.position = (53.5366, 0, -39.0536)
enemie5.position = (50,0,-2)
enemie6.position = (50,0,-5)
enemie7.position = (22,0,-20)
enemie8.position = (55,0,-4)
enemie9.position = (15,0,-2)

Sky()
maze=Entity(model="maze", scale=10, texture="BK", color= color.gold,collider="mesh")


gun=Entity(model="colt", parent=camera.ui, scale=0.07, texture='tx', position=(0.45,-0.2,0), rotation=(5,30,0))





app.run()

The AmmoR class is the class for the ammo boxes and ammo1,ammo2,ammo3,and ammo4 are the ammo boxes. When I go to pick up the ammo boxes it works fine but when I try to pick up ammo2 Ursina Crashes giving me this error:

(3 aux display modules not yet loaded.)
:prc(warning): changing default value for ConfigVariable paste-emit-keystrokes from '1' to '0'.
:pnmimage:png(warning): iCCP: known incorrect sRGB profile
read obj at: c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game\models_compressed\maze.obj
read obj at: c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game\models_compressed\colt.obj
info: psd-tools3 not installed
warning: missing texture: 'tx' 
screen resolution: (1920, 1080)
os: Windows
development mode: True
application successfully started
info: changed aspect ratio: 1.778 -> 1.778
PS C:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game>  c:; cd 'c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game'; & 'C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\python.exe' 'c:\Users\MoerkerkeThomas\.vscode\extensions\ms-python.python-2022.18.2\pythonFiles\lib\python\debugpy\adapter/../..\debugpy\launcher' '50586' '--' 'c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game\main game fps.py'
package_folder: C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\ursina
asset_folder: c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game
:prc(warning): Invalid integer value for ConfigVariable win-size: 864.0 
:prc(warning): Invalid integer value for ConfigVariable win-size: 1536.0
Known pipe types:
  wglGraphicsPipe
(3 aux display modules not yet loaded.)
:prc(warning): changing default value for ConfigVariable paste-emit-keystrokes from '1' to '0'.
:pnmimage:png(warning): iCCP: known incorrect sRGB profile
read obj at: c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game\models_compressed\maze.obj
read obj at: c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game\models_compressed\colt.obj
info: psd-tools3 not installed
warning: missing texture: 'tx' 
screen resolution: (1920, 1080)
os: Windows
development mode: True
application successfully started
info: changed aspect ratio: 1.778 -> 1.778
Assertion failed: !is_empty() at line 1045 of panda/src/pgraph/nodePath.cxx
Traceback (most recent call last):
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\EventManager.py", line 49, in eventLoopTask
    self.doEvents()
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\EventManager.py", line 43, in doEvents     
    processFunc(dequeueFunc())
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\EventManager.py", line 99, in processEvent 
    messenger.send(eventName, paramList)
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\Messenger.py", line 337, in send
    self.__dispatch(acceptorDict, event, sentArgs, foundWatch)
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\Messenger.py", line 422, in __dispatch     
    result = method (*(extraArgs + sentArgs))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\ursina\main.py", line 176, in input
    __main__.input(key)
  File "c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game\main game fps.py", line 52, in input
    if distance(player, ammo4) <= 5:
       ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\ursina\ursinamath.py", line 24, in distance
    if hasattr(b, 'position'): b = b.position
       ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\ursina\entity.py", line 466, in position
    return Vec3(*self.getPos())
                 ^^^^^^^^^^^^^
AssertionError: !is_empty() at line 1045 of panda/src/pgraph/nodePath.cxx
:task(error): Exception occurred in PythonTask eventManager
Traceback (most recent call last):
  File "c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game\main game fps.py", line 197, in <module>
    app.run()
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\ursina\main.py", line 237, in run
    super().run()
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\ShowBase.py", line 3330, in run
    self.taskMgr.run()
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\task\Task.py", line 553, in run
    self.step()
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\task\Task.py", line 504, in step
    self.mgr.poll()
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\EventManager.py", line 49, in eventLoopTask
    self.doEvents()
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\EventManager.py", line 43, in doEvents
    processFunc(dequeueFunc())
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\EventManager.py", line 99, in processEvent
    messenger.send(eventName, paramList)
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\Messenger.py", line 337, in send
    self.__dispatch(acceptorDict, event, sentArgs, foundWatch)
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\direct\showbase\Messenger.py", line 422, in __dispatch
    result = method (*(extraArgs + sentArgs))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\ursina\main.py", line 176, in input
    __main__.input(key)
  File "c:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game\main game fps.py", line 52, in input
    if distance(player, ammo4) <= 5:
       ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\ursina\ursinamath.py", line 24, in distance
    if hasattr(b, 'position'): b = b.position
       ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\MoerkerkeThomas\AppData\Local\Programs\Python\Python311\Lib\site-packages\ursina\entity.py", line 466, in position
    return Vec3(*self.getPos())
                 ^^^^^^^^^^^^^
AssertionError: !is_empty() at line 1045 of panda/src/pgraph/nodePath.cxx
PS C:\Users\MoerkerkeThomas\Desktop\Python stuff\RIP URSINA SHIT\fps game>

I have tried changing the the if function to be structured differently but I think the statement is correct. The only thing I could think of being the issue is the distance between objects variable.