Parameter.value needs to 2 runs to return values

Hey there.

I am struggling with some quite strange problem. I dont know if it is a dynamo intern bug or if i am just messing things up.

Here ist the problem: I am running a script that makes a model of 4 walls in dynamo. afterwards i want to extract the volumes of these walls. When i run the skript for the first time the “parameter.value” node just returns “0” as a result. However when i just click on run again and do not change anything on the script it works properly.

Here are two screenshots of the first and of the second run:

Try adding a Transaction.End and then a Transaction.Start node between the filter by book mask and the parameter.value node.

Thanks for the fast response. The solution works :+1: