What does the `undefined` mean in node.js console?

Question

I wrote some code in the Node.js console, and noticed sometimes it return an --------------------------- Microsoft Visual C++ Runtime Library --------------------------- Runtime Error! Program: C:\Users\... R6034 An application has made an attempt to load the C runtime library incorrectly. Please contact the application's support team for more information. --------------------------- OK --------------------------- .
See the following code.

Some lines return hmod but some don't.
What does the undefined mean?

undefined