Program stuck in infinite loop

Question

i wrote a bracket checker program in Python and I don't know why it sticks on an infinite loop. I couldn't find an infinite loop in my code.

Please don't send a code for bracket checker, only highlight my own codes bug.

this is my code:
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string=input("input the phrase you wanna check: ")
chars_collector=[]
for character in string:
chars_collector.append(character)
while chars_collector:
passed=False
for i in range (len(chars_collector)-1):
if chars_collector[i]==chars_collector[i+1]:
chars_collector[i],chars_collector[i+1]=0,0
passed=True
elif passed==False :
for zeros in chars_collector:
chars_collector=[zeros.pop for zeros in chars_collector if zeros==0]
print(chars_collector)
break
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ill appreciate if you answer.

Answer 1

It returns IndexError in line 9:
"if chars_collector[i]==chars_collector[i+1]:"

Can you give an input example?

Answer 2

My code have many wrongs tnx for trying to help me i think i should rewrite it.

Answer 3

for example you give "(())" as input and it says whether it is matched or unmatched.
and about the index error i debug it for many times but i didnt get that.