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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 a939859fa..3a1379de0 100644
--- a/includes/form.inc
+++ b/includes/form.inc
@@ -832,7 +832,7 @@ function theme_checkbox($element) {
$checkbox .= 'name="'. $element['#name'] .'" ';
$checkbox .= 'id="'. $element['#id'].'" ' ;
$checkbox .= 'value="'. $element['#return_value'] .'" ';
- $checkbox .= ($element['#return_value'] == $element['#value']) ? ' checked="checked" ' : ' ';
+ $checkbox .= ($element['#value'] || (string)$element['#return_value'] == (string)$element['#value']) ? ' checked="checked" ' : ' ';
$checkbox .= drupal_attributes($element['#attributes']) . ' />';
if (!is_null($element['#title'])) {