#1 save regestry failed

[Anonymous]

calling save regestry from menu
XSLT->Stylesheets Regestry failed (backtrace appended)

it does work if a "save for future sessions" in customize buffer
"Xslt Process Registered Stylesheets" precedes

versions:
emacs 21.2.1 (Suse 8.2)
xslt-process 2.2

Debugger entered--Lisp error: (wrong-type-argument arrayp nil)
file-truename(nil)
(urlize (file-truename (buffer-file-name)))
(let ((filename ...)) (if (or ... ...) (progn ... ... ... ... ... ...) (if ... ...)
(toggle-read-only 0) (if ... ...)
(xslt-process-change-breakpoints-highlighting nil filename)
(xslt-process-setup-minor-mode xslt-process-mode-map
xslt-process-mode-line-string) (setq xslt-process-debug-mode
nil)))
(catch (quote --cl-block-nil--) (let (...) (if ... ... ... ... ... ... ... ...)))
(cl-block-wrapper (catch (quote --cl-block-nil--) (let ... ...)))
(block nil (let (...) (if ... ... ... ... ... ... ... ...)))
xslt-process-toggle-debug-mode(0)
(if xslt-process-mode (progn (setq
easy-menu-precalculate-equivalent-keybindings nil)
(easy-menu-add xslt-process-menu)
(xslt-process-setup-minor-mode xslt-process-mode-map
xslt-process-mode-line-string)) (setq minor-mode-alist (remassoc
... minor-mode-alist)) (setq minor-mode-map-alist (remassoc ...
minor-mode-map-alist)) (easy-menu-remove (quote ...))
(xslt-process-toggle-debug-mode 0))
xslt-process-mode()
run-hooks(xml-mode-hook)
ad-Orig-xml-mode()
(setq ad-return-value (ad-Orig-xml-mode))
(let (ad-return-value) (setq ad-return-value (ad-Orig-xml-mode))
(run-hooks (quote xml-mode-hook)) ad-return-value)
xml-mode()
set-buffer-major-mode(#<buffer .gnu-emacs-custom>)
find-file-noselect("~/.gnu-emacs-custom")
custom-save-delete(custom-set-variables)
custom-save-variables()
custom-save-all()
customize-save-customized()
call-interactively(customize-save-customized)