diff --git a/inc/abstractfield.class.php b/inc/abstractfield.class.php
index bd39bfb94..b91edce22 100644
--- a/inc/abstractfield.class.php
+++ b/inc/abstractfield.class.php
@@ -158,8 +158,9 @@ public function getAvailableValues() {
       $values = json_decode($this->question->fields['values']);
       $tab_values = [];
       foreach ($values as $value) {
-         if ((trim($value) != '')) {
-            $tab_values[$value] = $value;
+         $trimmedValue = trim($value);
+         if (($trimmedValue != '')) {
+            $tab_values[$trimmedValue] = $trimmedValue;
          }
       }
       return $tab_values;