Adafruit_Thermal has no destructor method

[montoyamoraga]

• Arduino board: Arduino Nano 33 BLE Sense

• Arduino IDE version (found in Arduino -> About Arduino menu): 1.8.13

• List the steps to reproduce the problem below (if possible attach a sketch or
  copy the sketch code in too):

I am using Adafruit Thermal Printer as a dependency on a project, where in a class I have an instance of Adafruit_Thermal, and when I delete this instance on my destructor method, I get the warning "warning: deleting object of polymorphic class type 'Adafruit_Thermal' which has non-virtual destructor might cause undefined behavior".

as far as i know this warning could be fixed with a destructor of Adafruit_Thermal