Map output invalid after first run, following runs are valid!

Hi!

 I have a very strange problem: I use a map to create an output message. This map checks whether nodes contain data (with the logical functoid NOT EQUAL) and then maps the value of the source node to the target node. After deploying this solution and restarting the host instance, the output file contains nodes with empty data. Running the same map again, it produces the correct output (i.e. omitting the empty nodes).

 Does anybody have a solution for this strange behaviour?

Best regards,

Bas Dirkse