Can anyone please help me with this script?

I've made a key generator that used to work but no longer does, It just keeps crashing instead.

import random
chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890"
while 1:
    key_len = int(input("What length would you like your key to be?: "))
    key_count = int(input("How many keys would you like?: "))
    for x in range(0,key_count):
        key = ""
        for x in range(0,key_len)
            key_char = random.choice(chars)
            key      = key + key_char
        print("Here's your key: ", key)