IndexError: image index out of range Unicorn Hat Mini

Running the python code posted below, at seems like random intervals I get the following error. Which I am lost with trying to figure out what is causing it?

Traceback (most recent call last):
  File "/home/pi/mini_clock.py", line 64, in <module>
    if image.getpixel((x + offset_x, y)) == 255:
  File "/usr/lib/python3/dist-packages/PIL/Image.py", line 1333, in getpixel
    return self.im.getpixel(xy)
IndexError: image index out of range

The code below is a modified version of the text.py file found in the examples for the Unicorn hat Mini.

#!/usr/bin/env python3
import time, datetime
import sys

from PIL import Image, ImageDraw, ImageFont
from unicornhatmini import UnicornHATMini

unicornhatmini = UnicornHATMini()

rotation = 180
if len(sys.argv) > 1:
    try:
        rotation = int(sys.argv[1])
    except ValueError:
        print("Usage: {} <rotation>".format(sys.argv[0]))
        sys.exit(1)

unicornhatmini.set_rotation(rotation)
display_width, display_height = unicornhatmini.get_shape()

print("{}x{}".format(display_width, display_height))

unicornhatmini.set_brightness(0.5)

font = ImageFont.truetype("5x7.ttf", 8)


offset_x = 0

while True:

    text = time.strftime("%A %B %-d %-I:%M%p")

    text_width, text_height = font.getsize(text)

    image = Image.new('P', (text_width + display_width + display_width, display_height), 0)
    draw = ImageDraw.Draw(image)

    

    draw.text((display_width, -1), text, font=font, fill=255)
    
    for y in range(display_height):
        for x in range(display_width):
            if image.getpixel((x + offset_x, y)) == 255:
                unicornhatmini.set_pixel(x, y, 0, 255, 0)
            else:
                unicornhatmini.set_pixel(x, y, 0, 0, 0)

    offset_x += 1
    if offset_x + display_width > image.size[0]:
        offset_x = 0

    unicornhatmini.show()
    time.sleep(0.05)

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