Error Script Task - Mapping

HI everyone, 

I'm building a process model to write a record to record type table. I have two nodes for my process for now, one is script task and one is write to record. At script task node, I use a!map function and hard code data like below. When I start process for debugging, I get the error (key can not be null). However, my key has value. I wonder do you have idea how to fix it ?