New to Java

i'm trying to add the values in the columns of a 2d array, and i know exactly what to do. the problem comes when the array is jagged, specifically when the firs row is shortest. when this happens, the program exits the first for loop because, well, i told it to when row<data.length.

the only way i seem to be able to have it print out without an out of bounds exception is by setting rowlength[0] in the inner loop. i have tried using if statements and even a third nested loop to skip the row once the maximum number of columns is reached, but had no success... perhaps i am going about this the wrong way? please help, i'm going insane :)

 int[][]data = { {3, 2, 5},
                    {1, 4, 4, 8, 13},
                    {9, 1, 0, 2},
                    {0, 2, 6, 3, -1, -8}};

    int[]rowlength = new int[data.length];
    int sum = 0;      
  
    
    for (int row=0; row<data.length;row++)
    {
        rowlength[row]=data[row].length;          
    }
    
        for (int col=0; col<rowlength[0];col++)
        {
            sum=0;
                for (int row=0; row<data.length;row++)
                {                
                    sum = sum + data [row][col];   
                }
            System.out.println(sum);
        }
    
   }