TypeError: Cannot call method “getName” of null. (line 344, file “Code”, project “Request Time Off Workflow”)

Question

I am creating a Workflow for time-off requests using this How-To Guide: https://docs.google.com/document/d/1y6x90S_q_cwdl4LGVDDSqMyuikx1zmPFyVQfSlYsKLk/edit.

When a