diff --git a/htdocs/adherents/type.php b/htdocs/adherents/type.php
index 14bbcb8e854..1819925e723 100644
--- a/htdocs/adherents/type.php
+++ b/htdocs/adherents/type.php
@@ -678,7 +678,16 @@ if ($rowid > 0)
 			print '<br><br><table class="border" width="100%">';
 			foreach($extrafields->attribute_label as $key=>$label)
 			{
-				$value=(isset($_POST["options_".$key])?$_POST["options_".$key]:(isset($adht->array_options['options_'.$key])?$adht->array_options['options_'.$key]:''));
+				if (isset($_POST["options_" . $key])) {
+					if (is_array($_POST["options_" . $key])) {
+						// $_POST["options"] is an array but following code expects a comma separated string
+						$value = implode(",", $_POST["options_" . $key]);
+					} else {
+						$value = $_POST["options_" . $key];
+					}
+				} else {
+					$value = $adht->array_options["options_" . $key];
+				}
 				print '<tr><td width="30%">'.$label.'</td><td>';
 				print $extrafields->showInputField($key,$value);
 				print "</td></tr>\n";
diff --git a/htdocs/comm/action/card.php b/htdocs/comm/action/card.php
index 2e35b8004f0..c011717c0cc 100644
--- a/htdocs/comm/action/card.php
+++ b/htdocs/comm/action/card.php
@@ -1202,7 +1202,16 @@ if ($id > 0)
 			print '<br><br><table class="border" width="100%">';
 			foreach($extrafields->attribute_label as $key=>$label)
 			{
-				$value=(isset($_POST["options_".$key])?$_POST["options_".$key]:(isset($object->array_options['options_'.$key])?$object->array_options['options_'.$key]:''));
+				if (isset($_POST["options_" . $key])) {
+					if (is_array($_POST["options_" . $key])) {
+						// $_POST["options"] is an array but following code expects a comma separated string
+						$value = implode(",", $_POST["options_" . $key]);
+					} else {
+						$value = $_POST["options_" . $key];
+					}
+				} else {
+					$value = $object->array_options["options_" . $key];
+				}
 				print '<tr><td width="30%">'.$label.'</td><td>';
 				print $extrafields->showOutputField($key,$value);
 				print "</td></tr>\n";
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index f9eeffbb018..99e497046e0 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -3564,16 +3564,16 @@ abstract class CommonObject
         else return 0;
     }
 
-   /**
-     * Function to show lines of extrafields with output datas
-     *
-     * @param	object	$extrafields	Extrafield Object
-     * @param	string	$mode			Show output (view) or input (edit) for extrafield
-	 * @param	array	$params			Optionnal parameters
-	 * @param	string	$keyprefix		Prefix string to add into name and id of field (can be used to avoid duplicate names)
-     *
-     * @return string
-     */
+	/**
+	 * Function to show lines of extrafields with output datas
+	 *
+	 * @param Extrafields   $extrafields    Extrafield Object
+	 * @param string        $mode           Show output (view) or input (edit) for extrafield
+	 * @param array         $params         Optional parameters
+	 * @param string        $keyprefix      Prefix string to add into name and id of field (can be used to avoid duplicate names)
+	 *
+	 * @return string
+	 */
     function showOptionals($extrafields, $mode='view', $params=0, $keyprefix='')
     {
 		global $_POST, $conf;
@@ -3601,7 +3601,16 @@ abstract class CommonObject
 						$value=$this->array_options["options_".$key];
 						break;
 					case "edit":
-						$value=(isset($_POST["options_".$key])?$_POST["options_".$key]:$this->array_options["options_".$key]);
+						if (isset($_POST["options_" . $key])) {
+							if (is_array($_POST["options_" . $key])) {
+								// $_POST["options"] is an array but following code expects a comma separated string
+								$value = implode(",", $_POST["options_" . $key]);
+							} else {
+								$value = $_POST["options_" . $key];
+							}
+						} else {
+							$value = $this->array_options["options_" . $key];
+						}
 						break;
 				}
 				if ($extrafields->attribute_type[$key] == 'separate')
diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 99ec23c6a73..40ba0e666ae 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -1155,7 +1155,7 @@ class ExtraFields
 				else if (in_array($key_type,array('checkbox')))
 				{
 					$value_arr=GETPOST("options_".$key.$keyprefix);
-					$value_key=implode($value_arr,',');
+					$value_key=implode(',', $value_arr);
 				}
 				else if (in_array($key_type,array('price','double')))
 				{