I tried to solve an easy leecode question and I keep getting index out of bounds error, when I try the same solution on visual studio I dont get this error.
Here is the question and the code (I am failing a example 3):

Here is my code:

def merge(nums1, m, nums2, n ):
        """
        Do not return anything, modify nums1 in-place instead.
        """

        i1 = 0
        i2 = 0
        tmp = 0
        while i1 < n + m :
            if nums1[i1] == 0:
                nums1[i1] = nums2[i2]
                i1+=1
                i2+=1

            elif nums1[i1] <= nums2[i2]:
                i1 += 1
            else:
                tmp = nums2[i2]
                nums2[i2] = nums1[i1]
                nums1[i1] = tmp
                i1 += 1

It says Im out of bounds on this line: nelif nums1[i1] <= nums2[i2]:
But I never reach this line because at this point I am out of the loop.
The error:

Runtime Error
IndexError: list index out of range
                      ~~~~~^^^^
    elif nums1[i1] <= nums2[i2]:
Line 16 in merge (Solution.py)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ret = Solution().merge(param_1, param_2, param_3, param_4)
Line 58 in _driver (Solution.py)
    _driver()
Line 70 in <module> (Solution.py)