value for variable is null: for

[iceback]

GNU Emacs 28.0.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0)
of 2022-02-06
jdee-20191102.1426
java 17.0.1 2021-10-19 LTS
Linux (Ubuntu-20.04)
Debugger entered--Lisp error: (void-variable for)
jdee-db-nullify-breakpoint-markers()
kill-buffer(#)
Buffer-menu-execute()
electric-buffer-list(nil)
funcall-interactively(electric-buffer-list nil)
command-execute(electric-buffer-list)

open java source code file

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