Ghostscript error "Can't find font with non-string name: false." in RHEL

Issue

We are trying to use a new font with ghostscript, but the command returns the error message "Can't find font with non-string name: false", as follows:

$ gs -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=j.pdf -f file.ps
GPL Ghostscript 9.25 (2018-09-13)
Copyright (C) 2018 Artifex Software, Inc.  All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Loading NimbusRoman-Regular font from /usr/share/ghostscript/Resource/Font/NimbusRoman-Regular...
    4691640 3177432 1938620 621144 2 done.
Loading ArialUnicode-Identity-UTF16-H font from /usr/share/ghostscript/Resource/Font/ArialUnicode-Identity-UTF16-H...
    Can't find font with non-string name: false.
Querying operating system for font files...
Can't find (or can't open) font file /usr/share/ghostscript/Resource/Font/false.
Can't find font with non-string name: false.
Didn't find this font on the system!
Substituting font Courier for false.
Loading NimbusMonoPS-Regular font from /usr/share/ghostscript/Resource/Font/NimbusMonoPS-Regular...
    4797728 3435753 4354504 2997846 2 done.