Dynamic expression builder loses value on edit

Wappler General Bugs
#1

i am using wappler 6.5, php, windows.

i am trying to add a dynamic toggle class. it adds it ok, but, if i try to edit then it blanks it, see attached video
thanks

vid1

Expression Builder: error when "is not set" is present
#2

Please paste the exact expression code you have for the condition.

#3 
<p dmx-class:syle17="Due-Paid&gt;0">
    {{(Due - Paid).formatCurrency('Є', '.', ',', 2)}}
</p>
#4
#5

I experienced the same issue already reported: