ValueError: Coordinate 'right' is less than 'left'

Question

while cropping an image with pillow/PIL, i got the following Error:

ValueError: Coordinate 'right' is less than 'left'

I am not able to resolve why cropping left side more than right would cause a problem.

The code below crops the image according to the widget size in tkinter. After several run it works as desired but on the next it raises the same error.

import tkinter as tk
from math import sqrt
from PIL import Image, ImageTk

class Transparent:
    # Only works when image is placed
    def __init__(self, widget, root, img_path):
        root.update()
        self.path = img_path
        self.widget_cod = (widget.winfo_rootx(), widget.winfo_rooty())
        self.widget_size = (widget.winfo_width(), widget.winfo_height())
        self.root_size = (root.winfo_width(), root.winfo_height())
        self.distace_formulae = lambda x2, x1, y2, y1: math.sqrt(
            (x2 - x1) ** 2 + (y2 - y1) ** 2
        )
        self.cal_dis()
        self.show()

    def cal_dis(self):
        self.left = self.distace_formulae(
            x1=0, x2=self.widget_cod[0], y1=self.widget_cod[1], y2=self.widget_cod[1]
        )
        self.top = self.distace_formulae(
            x1=self.widget_cod[0], x2=self.widget_cod[0], y1=0, y2=self.widget_cod[1]
        )
        self.bottom = (
            self.distace_formulae(
                x1=self.widget_cod[0],
                x2=self.widget_cod[0],
                y1=self.widget_cod[1],
                y2=self.root_size[1],
            )
            - self.widget_size[1]
        )

        self.right = (
            self.distace_formulae(
                x1=self.widget_cod[0],
                x2=self.root_size[0],
                y1=self.widget_cod[1],
                y2=self.widget_cod[1],
            )
            - self.widget_size[1]
        )

    def show(self):
        self.img = Image.open(self.path)
        print(self.left, self.top, self.right, self.bottom)
        self.img = self.img.crop((self.left, self.top, self.right, self.bottom))
        self.img.show()