Why this error of "AddressSanitizer: heap-buffer-overflow" is happening?

I am a beginner. I am getting an error of

==31==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000000118 at pc 0x000000345e5c bp 0x7ffe75dfbff0 sp 0x7ffe75dfbfe8
READ of size 4 at 0x602000000118 thread T0

The error message is long so the above is just a snippet of it. I think the error is due to the line which I highlighted here with comments but I am not sure

class Solution {
public:
    bool uniqueOccurrences(vector<int>& arr)
    {

        vector<int> temp(10, 0);
        int n = arr.size(), i = 0, k = 0, j = 0;

        while (i < n) {
            for (int j = 0; j < n; j++) {
                if (arr[j] == arr[i]) {
                    temp[k]++;
                    arr[j] = -1000;
                }
            }

            while (arr[i] == -1000 && i < 1000) // THIS LINE
                i++;
            k++;
        }

        for (i = 0; i < n; i++)
            for (int j = i + 1; j < n; j++) {
                if (temp[i] == temp[j])
                    return false;
            }

        return true;
    }
};

I was making a simple program to find a unique number in an array

while(arr[i]==-1000)   // THIS LINE
    i++;

There's no limit on i, it can go out of bounds as long as the condition you did write is true.