Kotlin Unparseable and - NullPointerException error

Question

What I expect: the 'for loop' brings the number of columns that will be displayed in the table, the start date, and the end date are taken by an object. the transaction date is taken by a different object. The start date variable gets the exception and the transaction date gets the value without a problem.

Code:

if(date >0){//no of dates for the selected week
    for (i in 0 until date) {
        val dateFormat = SimpleDateFormat("yyyy-MM-dd")
        val tv_Date = TextView(this)
        val transDate = SortedDateHashMap[i].transactionDate
        val start = SortedExpenseDateHashMap[i]!!.weekStart
        val end = SortedExpenseDateHashMap[i]!!.weekEnd
        val startDate = dateFormat.parse(start)
        val endDate = dateFormat.parse(end)
        var transactionDat = dateFormat.parse(transDate)
        if(transactionDat.before(endDate) && transactionDat.after(startDate)){
            setColor(tv_Date)
            tv_Date.setPadding(10, 15, 10, 10)
            tv_Date.gravity = Gravity.CENTER
            tv_Date.layoutParams = params3
            tv_Date.text = SortedDateHashMap[i].transactionDate
        }
    }
}

Answer 1

Used null safe and wrote the code in the try..catch exception. Worked