Global variable is working on other conditions except this one in python

Good day to everyone. I need help with my python program. I am almost done making a police profile system wherein you can input and search. The problem I have is in the search function. Here is the bit of the source code to get started.

    global Value
    def config1():
            Entry1.config(state="normal")
            Entry1.delete(first=0,last=99)
            Entry1.insert(0,"LastName")
            Entry1.config(state="disabled")
            ThisEntry.delete(first=0,last=99)
            Value = Police['text']

    def config5():
            Entry1.config(state="normal")
            Entry1.delete(first=0,last=99)
            Entry1.insert(0,"LastName")
            Entry1.config(state="disabled")
            ThisEntry.delete(first=0,last=99)
            Value = Visitor['text']

    def Search():
            Entry1.config(state="normal")
            x = Entry1.get()
            y = ThisEntry.get()
            Entry1.config(state="disabled")
            global Value

            if x == "LastName" and Value == "POLICE IDENTITY":
                    z = 0
                    ThisText.config(state="normal")
                    ThisText.delete("1.0","end")
                    c.execute("SELECT LastName FROM Police WHERELastName=?",(y,))
                    row = c.fetchall()
                    for a in row:
                            c.execute("SELECT * FROM Police WHERE LastName=?",(y,))
                            row = c.fetchall()

            elif x == "LastName" and Value == "VISITOR":
                    z = 0
                    ThisText.config(state="normal")
                    ThisText.delete("1.0","end")
                    ThisText.insert(INSERT,"VISITORS")
                    c.execute("SELECT LastName FROM Visitors WHERE LastName=?",(y,))
                    row = c.fetchall()
                    for a in row:
                            ThisText.insert(INSERT,"\n\n")
                            ThisText.insert(INSERT,"Visitor Number: ")
                            ThisText.insert(INSERT,row[z][0])
                            ThisText.insert(INSERT,"\n")
                            ThisText.insert(INSERT,"First Name: ")
                            ThisText.insert(INSERT,row[z][1])
                            ThisText.insert(INSERT,"\n")
                            ThisText.insert(INSERT,"Middle: ")
                            ThisText.insert(INSERT,row[z][2])
                            ThisText.insert(INSERT,"\n")
                            ThisText.insert(INSERT,"Last Name: ")

I used the functions def config1(): and def config5(): just to change the value of the Value. I declared the Value as global since I need it just for changing the value.

The main goal is that the condition will return a row if the value is equal to the record that I want to search and if it is equal to the type of record that I want to search which is the Value.

So if I search for the LastName in Police Identity, it would return a row. Same with searching for Visitor.

If I search for the last name in the Police Identity Tab, it returns a row properly. But whenever I try to search for the last name in the Visitor Tab, it returns this error:

    Traceback (most recent call last):
       File "C:\Users\User\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1550, in __call__
       return self.func(*args)
       File "C:\Users\User\Desktop\School Files (Don't Touch)\Project in SE\Project in SE.py", line 1420, in Search
       elif x == "LastName" and Value == "POLICE IDENTITY":
       NameError: name 'Value' is not defined

I tried to declare the global variable on the function itself also but it still doesn't work. I really don't get why it works on one condition but doesn't work on the other condition. I don't know if Python is playing a game on me or something.