LinSSID shows -110db wrongly

[beta-tester]

hello,
i installed LinSSID to visualize the wifi channel usage in my environment.
i noticed, that a signal strenth of -110db is shown flipped downwards in the channel graph to the invisible part - only the first few pixels are visible of those -110db channel graphs.
in the preferences of LinSSID, i tried to adjust the strengh min value from -100db to -110db, but the input field does not allow to enter a value less than -100. so it is not fixable for the enduser.

the fix would be to remove the hardcoded strength min value or at least changing the limit from -100 down to -120 i think.

OS is ubuntu 19.10 (also tried 20.04);
installed version of LinSSID is 3.6 (sudo apt install linssid);