Error Message: Tried to register a path/listener combination that is already in the model

I get hundreds of these error messages after starting up. What does it mean? Error is:

"Tried to register a path/listener combination that is already in the model. Value: TagSubscription(path=[default]TD23, listener=com.inductiveautomation.perspective.gateway.binding.expression.ExpressionBindingTagListener@394059fc) "

Can somebody help with this topic?

I have the same issue. On the button, mouse event I have a script. In the script, I am asking if the tag value is different from some value if yes I am writing in that tag some another value.
Something like.
if system.tag.read(“xx”).value!=“”:
system.tag.write(“xxx”, “test”)

And on this, I have an error " [Tried to register a path/listener combination that is already in the model]. What is wrong with my expression?

Yes, this bug has been present for a long time now…

Does it happen in v8.1 ? (v8.0 is end-of-life.)

Yes, in v8.1.15 too (perspective, not vision)…