Bug in TextField in flutter

Question

When I tap on Text Field and write from keyboard then I click done, all data from Text Field was cleared. This is my code:

TextField(
  controller: controller,
  keyboardType: textInputType,
  decoration: InputDecoration(
    hintText: hintText,
    enabledBorder: const OutlineInputBorder(
      borderSide: BorderSide(color: Colors.grey, width: 0.5),
    ),
    focusedBorder: const OutlineInputBorder(
      borderSide: BorderSide(
        color: Colors.black,
        width: 1,
      ),
    ),
  ),
)

my controller: TextEditingController controller = TextEditingController();