Error when string contains "Word Joiner", "BOM", "OGHAM Space Mark" or "zero-width space" characters

[JamoCA]

While importing international data from a Microsoft Excel file (using ColdFusion2016u11 w/Java 11.0.2), I encountered a java.lang.NullPointerException error when a string contained a space/control character. Is this a known issue?

Here's a list of characters (decimal & hex codes provided) that I tested against.
https://gist.github.com/JamoCA/42c3be286185aff0476d5888f0a819ff

My initial tests included the Word Joiner (decimal 8288), BOM (decimal 65279), OGHAM space mark (decimal 5760) and zero-width space (decimal 8203) and each caused the same error.

To work around it, I wrote a separate function to sanitize "unsafe" characters prior to using Junidecode.