The below runtime error is returned when I run my code via the Leetcode web console. I created test cases using the examples provided in the exercise and all tests pass when I run them in my IDE. I've included a link to my code and test cases below. Yes, I am aware that the exercise specifies not to return a value from merge(). I did include a return statement in my code for testing purposes but removed it from the code that I pasted into the Leetcode web console (pasted code below).
My question: Is this runtime error something that I need to troubleshoot as part of this exercise, or have I left the "safe area" of the exercises intended purpose? I.e. Is this something that I should try to troubleshoot and correct or have I somehow "broken" the Leetcode web console?

Code I pasted into the Leetcode Console (my test cases file is availabe for review via github)
from typing import List
class Solution:
def merge(nums1: List[int], m: int, nums2: List[int], n: int) -> None:
"""
Do not return anything, modify nums1 in-place instead.
"""
# nums1 pointer
h = 0
# nums2 pointer
j = 0
complete = False
while not complete:
# edgecase - nums2 is empty
if not nums2:
complete = True
continue
# edgecase - nums1 only contains placeholder elements
if m == 0:
nums1[:] = nums2
complete = True
continue
while h < m + n:
# case - the end of nums1 is found. Add the remaining nums2 elements to nums1
if nums1[h] == 0:
nums1[h:] = nums2[j:]
h += len(nums2[j:])
break
# case - nums2 element needs to be merged into nums1
if nums1[h] > nums2[j]:
nums1.insert(nums2[j], h)
j += 1
h += 1
complete = True