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-rw-r--r--lisp/cus-theme.el2
1 files changed, 2 insertions, 0 deletions
diff --git a/lisp/cus-theme.el b/lisp/cus-theme.el
index afb760a7d4e..502220d278d 100644
--- a/lisp/cus-theme.el
+++ b/lisp/cus-theme.el
@@ -160,6 +160,8 @@ the directory " custom-theme-directory "\n\n")
(message "%s is already in the theme" (symbol-name symbol)))
((not (boundp symbol))
(message "%s is not defined as a variable" (symbol-name symbol)))
+ ((eq symbol 'custom-enabled-themes)
+ (message "Custom theme cannot contain `custom-enabled-themes'"))
(t
(widget-insert "\n")
(let ((widget (widget-create 'custom-variable