Getting Null error if numbers are removed from the tool

[Mani]

Getting the below error if the number is removed from the widget, with the help of emulator keyboard
.

If no value is available the above error is thrown _clampAndUpdate function in number_increment_decrement.dart file.

Am using the latest version.
Version details : number_inc_dec: ^0.8.0

my code

NumberInputPrefabbed.roundedButtons(
  controller: _noOfPagesController,
  min: 1,
  max: 1000,
  initialValue: 5,
  incDecBgColor: Colors.blueAccent,
  enableMinMaxClamping: true,
  autovalidateMode: AutovalidateMode.always,
  buttonArrangement: ButtonArrangement.incRightDecLeft,
  validator: (value) {
    if (value == null || value.isEmpty) {
      return "1";
    }
  },
),

Getting the below error even after including the validator function any thoughts to fix this

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