Null Reference Exception when trying to increment array C#

Question

I am constantly getting a NullReferenceException when attempting to increment a value in an int[]. I have tried initializing the array (counts) multiple ways, such as
int[] counts = {0, 0};
int[] counts = new int[]{0, 0};
int[] counts = new int[2]{0, 0};
int[] counts = new int[2];
None of these ways gives me a different result, see code below:

 int[] counts = new int[2] {0, 0};
Console.WriteLine("Incrementing the warehouse dictionary at index: " + i);
//This will check and see if it's contained
if (warehouseCostsArray[i] != "")
{
    //This will check and see if it has the lowest price
    if (warehouseCostsArray[i] == "0")
    {
        //This will check and see if this brand already exists in the warehouse dictionary, it will return the counts if it is found
        if (dictionaryList[i].TryGetValue(lineContentsBrand, out counts))
        {
            Console.WriteLine("11\n");
            //incrememnt the counts based on the conditions
            counts[0]++;
            counts[1]++;
            //reassign that value in the dictionary
            dictionaryList[i][lineContentsBrand] = counts;

        }
        //same thing as above except this is triggered if that brand does not exist
        else
        {
            Console.WriteLine("22\n");
            counts[0] = 1;
            counts[1] = 1;
            dictionaryList[i].Add(lineContentsBrand, counts);

        }
    }
    //This is triggered if the warehouse contains the sku but does not have the lowest price.
    else
    {
        //same thing as above except this time we are not going increment counts[1]
        if (dictionaryList[i].TryGetValue(lineContentsBrand, out counts))
        {
            Console.WriteLine("33\n");
            counts[0]++;
            dictionaryList[i][lineContentsBrand] = counts;

        }
        else
        {
            Console.WriteLine("44\n");
            //This will add if it doesnt exist, leaving counts[1] as 0
            Console.WriteLine("Incrementing counts 0");
            counts[0] = 1;
            Console.WriteLine("Incrementing counts 1");
            counts[1] = 0;
            Console.WriteLine("Adding entry to the dictionary");
            dictionaryList[i].Add(lineContentsBrand, counts);

        }
    }
 }

The error is happening in the last else when trying to set

counts[0]=1;

Here is an included pic of the output Console output

I know this is a question that is asked a lot, but I am totally stuck and cant seem to get past this. Any help is appreciated!

Thanks, Ben