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-rw-r--r--includes/form.inc2
1 files changed, 1 insertions, 1 deletions
diff --git a/includes/form.inc b/includes/form.inc
index 9875c1b0a..9b259c482 100644
--- a/includes/form.inc
+++ b/includes/form.inc
@@ -1625,7 +1625,7 @@ function form_type_checkbox_value($element, $input = FALSE) {
else {
// Disabled form controls are not submitted by the browser. Ignore any
// submitted value and always return default.
- return $element['#default_value'];
+ return isset($element['#default_value']) && $element['#default_value'] === $element['#return_value'] ? $element['#return_value'] : 0;
}
}
}