TelephonyManager Crashs on Android 10

I am getting the below stack trace in my Crashlytics for wide range of android 10 devices. Fatal Exception: java.lang.NullPointerException Attempt to invoke virtual method 'java.lang.Throwable android.os.ParcelableException.getCause()' on a null object reference

android.telephony.TelephonyManager$1.lambda$onError$2
android.telephony.TelephonyManager$1.lambda$onError$2 (TelephonyManager.java:5346)
android.telephony.-$$Lambda$TelephonyManager$1$DUDjwoHWG36BPTvbfvZqnIO3Y88.run (-.java:6)
java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1167)
java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:641)
java.lang.Thread.run (Thread.java:919)

No Reference what part of app causing this but I am using TelephonyManager to get device MCC and MNC as below

  fun getMCCFromDevice(context: Context): String? {
    try {
        val tm = context.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
        if (tm != null) {
            val networkOperator = tm!!.getNetworkOperator()
            if (!TextUtils.isEmpty(networkOperator)) {
                return networkOperator.substring(0, 3)
            }
        }
    } catch (e: Exception) {
        e.printStackTrace()
    }

    return null

}

fun getMNCFromDevice(context: Context): String? {
    try {
        val tm = context.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
        if (tm != null) {
            val networkOperator = tm!!.getNetworkOperator()
            if (!TextUtils.isEmpty(networkOperator)) {
                return networkOperator.substring(3) // Extract MNC part
            }
        }
    } catch (e: Exception) {
        e.printStackTrace()
    }

    return null
}