Help in finding ExceptionError

[menator01]

The script is working as expected but, I keep getting the error in the console. I've not been able to silence or correct it.
Any help would be great. Thanks

Error:
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.8/tkinter/__init__.py", line 1886, in __call__
    return self.func(*args)
TypeError: set() missing 1 required positional argument: 'last'
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.8/tkinter/__init__.py", line 1886, in __call__
    return self.func(*args)
TypeError: set() missing 1 required positional argument: 'last'
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.8/tkinter/__init__.py", line 1886, in __call__
    return self.func(*args)
TypeError: set() missing 1 required positional argument: 'last'
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.8/tkinter/__init__.py", line 1886, in __call__
    return self.func(*args)
TypeError: set() missing 1 required positional argument: 'last'

Relevant code

class AddRecipe:
    '''doc'''
    def __init__(self):
        pass

    def my_form(self):
        '''docstring'''

# More code .....

        btn_style = ttk.Style()
        btn_style.configure('Submit.TButton')
        submit_btn = ttk.Button(bottom_frame, text='Submit Recipe', style='Submit.TButton', \
        command=partial(self.submit_values, title_entry, ingredients_entry, \
        instructions_entry, prep_time, cook_time))
        submit_btn.grid(column=5, row=0)

    def submit_values(self, title, ingredients, instructions, prep_time, cook_time):
        '''Docstring'''
        if not title.get() or not ingredients.get('1.0', 'end-1c') or not \
        instructions.get('1.0', 'end-1c'):
            messagebox.showerror(title='Input Error', \
            message='Required fields: Title, Ingredients, and Instructions')
            self.top.destroy()
            self.my_form()

        print(title.get())
        print(ingredients.get('1.0', 'end-1c'))
        print(instructions.get('1.0', 'end-1c'))
        print(prep_time.get())
        print(cook_time.get())
        msg = messagebox.askyesno(title='Add Recipe', message='Add another recipe?')
        if msg is True:
            self.top.destroy()
            self.my_form()
        if msg is False:
            self.top.destroy()