Ошибка _tkinter.TclError: wrong # coordinates: expected 0 or 4, got 0

from tkinter import *
from random import *
from math import *
from time import *
 
 
def left(event):
    for i in range(7):
        canvas.move(ship1, -SHIP_LINER, 0)
        canvas.move(ship2, -SHIP_LINER, 0)
        
def right(event):
    for i in range(7):
        canvas.move(ship1, SHIP_LINER, 0)
        canvas.move(ship2, SHIP_LINER, 0)    
        
def up(event):
    for i in range(7):
        canvas.move(ship1, 0, -SHIP_LINER)
        canvas.move(ship2, 0, -SHIP_LINER)    
        
def down(event):
    for i in range(7):
        canvas.move(ship1, 0, SHIP_LINER)
        canvas.move(ship2, 0, SHIP_LINER)    
        
 
def create_bubble():
    x = WIDTH
    y = randint(0, HIGHT)
    r = randint(MIN_BUB_R, MAX_BUB_R)
    speed = randint(MIN_BUB_SPEED, MAX_BUB_SPEED)
    id = canvas.create_oval(x-r, y-r, x+r, y+r, outline="grey")
    bub_id.append(id)
    bub_r.append(r)
    bub_speed.append(speed)
    
    
def move_bubbles():
    for i in range(len(bub_id)):
        canvas.move(bub_id[i], -bub_speed[i], 0)
        
HIGHT = 500
WIDTH = 800
 
MID_X = WIDTH / 2
MID_Y = HIGHT / 2
 
window = Tk()
window.title("mne skuchna")
 
canvas = Canvas(window, width=WIDTH, height=HIGHT, bg = "lightskyblue")
 
canvas.pack()
 
SHIP_LINE = 10
SHIP_LINER = 1
 
SIHP_R = 15
 
ship1 = canvas.create_polygon(20,5,35,20,20,35,5,20, fill="darkslateblue", outline = "darkslateblue")
ship2 = canvas.create_oval(5, 5, 35, 35, outline="darkslateblue")
 
canvas.move(ship1, MID_X-16, MID_Y-16)
canvas.move(ship2, MID_X-16, MID_Y-16)
 
window.bind("<Left>", left)
window.bind("<Right>", right)
window.bind("<Up>", up)
window.bind("<Down>", down)
 
bub_id = list()
 
bub_r = list()
 
bub_speed = list()
 
MIN_BUB_R = 10
MAX_BUB_R = 30
 
MIN_BUB_SPEED = 1
MAX_BUB_SPEED = 10
 
BUB_CHANCE = 10
 
score = 0
 
TIME_LIMIT = 30
 
TIME_END = time() + TIME_LIMIT
 
canvas.create_text(50, 30, text='TIME', fill='black')
canvas.create_text(111, 30, text='SCORE', fill='black')
 
time_text = canvas.create_text(50, 45, text=TIME_LIMIT, fill='black')
score_text = canvas.create_text(111, 45, text=0, fill='black')
 
while time() < TIME_END:
    chance = randint(1, BUB_CHANCE)
    if chance == 1:
        create_bubble()
    move_bubbles()
    window.update()
    sleep(0.01)
    
window.mainloop()