diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index a840dbd02b9..6e92714293b 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -2131,8 +2131,7 @@ class ExtraFields
 					}
 				} elseif ($key_type == 'select') {
 					// to detect if we are in search context
-					$value_arr_test = GETPOST($keysuffix."options_".$key.$keyprefix, 'none');
-					if (is_array($value_arr_test)) {
+					if (GETPOSTISARRAY($keysuffix."options_".$key.$keyprefix)) {
 						$value_arr = GETPOST($keysuffix."options_".$key.$keyprefix, 'array:aZ09');
 						// Make sure we get an array even if there's only one selected
 						$value_arr = (array) $value_arr;
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index f9672f776e5..9c268d31980 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -370,6 +370,32 @@ function GETPOSTISSET($paramname)
 	return $isset;
 }
 
+/**
+ * Return true if the parameter $paramname is submit from a POST OR GET as an array.
+ * Can be used before GETPOST to know if the $check param of GETPOST need to check an array or a string
+ *
+ * @param 	string	$paramname		Name or parameter to test
+ *  @param	int		$method	     Type of method (0 = get then post, 1 = only get, 2 = only post, 3 = post then get)
+ * @return 	bool 				True if we have just submit a POST or GET request with the parameter provided (even if param is empty)
+ */
+function GETPOSTISARRAY($paramname, $method = 0)
+{
+	// for $method test need return the same $val as GETPOST
+	if (empty($method)) {
+		$val = isset($_GET[$paramname]) ? $_GET[$paramname] : (isset($_POST[$paramname]) ? $_POST[$paramname] : '');
+	} elseif ($method == 1) {
+		$val = isset($_GET[$paramname]) ? $_GET[$paramname] : '';
+	} elseif ($method == 2) {
+		$val = isset($_POST[$paramname]) ? $_POST[$paramname] : '';
+	} elseif ($method == 3) {
+		$val = isset($_POST[$paramname]) ? $_POST[$paramname] : (isset($_GET[$paramname]) ? $_GET[$paramname] : '');
+	} else {
+		$val = 'BadFirstParameterForGETPOST';
+	}
+
+	return is_array($val);
+}
+
 /**
  *  Return value of a param into GET or POST supervariable.
  *  Use the property $user->default_values[path]['createform'] and/or $user->default_values[path]['filters'] and/or $user->default_values[path]['sortorder']