diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index ed85a328edc..3d55b12c35c 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -1339,7 +1339,10 @@ class ExtraFields
 		}
 		elseif ($type == 'checkbox')
 		{
-			$value_arr = explode(',', $value);
+			$value_arr = $value;
+			if (!is_array($value)) {
+				$value_arr = explode(',', $value);
+			}
 			$out = $form->multiselectarray($keyprefix.$key.$keysuffix, (empty($param['options']) ?null:$param['options']), $value_arr, '', 0, '', 0, '100%');
 		}
 		elseif ($type == 'radio')