TypeError: text must be a unicode or bytes

import pygame
import sys
 
 
 
def check_win(mas, sign):
    zeroes = 0
    for row in mas:
        zeroes+= row.count(0)
        if row.count(sign)==3:
            return sign
    for col in range(3):
        if mas[0][col]==sign and mas[1][col]==sign and mas[2] [col] ==sign:
            return sign
    if mas [0][0] == sign and mas[1][1] == sign and mas[2][2]== sign:
        return sign
    if mas [0][2] == sign and mas[1][1] == sign and mas[2][0]== sign:
        return sign
    if zeroes==0:
        return 'Счет'
    return False
 
 
pygame.init ()
size_block = 100
margin = 15
width = heigth = size_block*3 + margin*4
 
size_window = (width,heigth)
screen = pygame.display.set_mode(size_window)
pygame.display.set_caption("Крестики Нолики")
 
black = (0, 0, 0)
red = (255, 0, 0)
green = (0, 255, 0)
white = (255, 255, 255)
mas = [[0]*3 for i in range(3)]
query = 0
 
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit(0)
        elif event.type == pygame.MOUSEBUTTONDOWN:
            x_mouse, y_mouse = pygame.mouse.get_pos()
            col = x_mouse // (size_block+margin)
            row = y_mouse // (size_block + margin)
            if mas[row][col] == 0:
                if query%2==0:
                    mas[row][col] = 'x'
                else:
                    mas[row][col] = 'o'
                query+=1
 
    for row in range(3):
        for col in range(3):
            if mas[row][col] == 'x':
                color = red
            elif mas[row][col] == 'o':
                color = green
            else:
                color = white
            x = col*size_block + (col+1)*margin
            y = row*size_block + (row+1)*margin
            pygame.draw.rect(screen, color, (x,y, size_block, size_block))
            if color==red:
                pygame.draw.line(screen, white, (x+5,y+5), (x+size_block-5, y+size_block-5), 5)
                pygame.draw.line(screen, white, (x + size_block-5, y + 5), (x+5, y + size_block - 5), 5)
            elif color==green:
                pygame.draw.circle(screen, white, (x+size_block//2, y+size_block//2), size_block//2-3, 5)
    if (query-1)%2==0: #x
        game_over = check_win(mas, 'x')
    else:
        game_over= (mas, 'o')
 
    if game_over:
        screen.fill(black)
        font = pygame.font.SysFont ('stxingkai', 80)
        text1 = font.render(game_over, True, white)
        text_rect = text1.get_rect()
        text_x = screen.get_width() / 2 - text_rect.width / 2
        text_y = screen.get_height() / 2 - text_rect.height / 2
        screen.blit(text1, [text_x, text_y])
 
    pygame.display.update()

text1 = font.render('game_over', True, white)