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You can add some print statements to see what is happening and answer your question. For example, I added a few and got the following as a result. From that you can see it's not as simple as you're...

You have an array of names that looks something like:

[ john a, john b, john z, john d, null, null ]

How will the null values be handled?

Post a sample run copied from your console that shows the inputs/outputs and the problem you've described. If you're asking for help with an error message, post the complete text of the error...