Error Executing Event Handler 'ForwardEvent'

Hello

I have a mashup with a led widget. I use getproperties to get the value and i am activating the auto update values from mashup

I have a weird behavior :

When i change the value manualy from the thing the property is updated automaticaly on the mashup (no problem)

When the value is changed from subscription function , the value is changed in the thing but  the led value still not changing and i have this error on the log monitor :

Error Executing Event Handler 'ForwardEvent' for event Type.Thing:Entity.MyThing:Event.DataChange

I get the value only when i refrech manualy the page.

the auto refresh widget does not exist so i have no other alternative.

I search in all the topics in the community but none is a solution : 1 here  and 2 here 

My thingworx version is :9.1

My code work perfectly on 9.3 version

Any help is welcome.

Thank you.