From 8626034e3c34cc8eed72972cd0c7f42a3273557d Mon Sep 17 00:00:00 2001
From: Julio <gugli100@gmail.com>
Date: Wed, 4 Nov 2015 08:41:09 +0100
Subject: [PATCH] fix query error due null see #7939

---
 main/exercice/calculated_answer.class.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/main/exercice/calculated_answer.class.php b/main/exercice/calculated_answer.class.php
index 81589ce1b8..c832adfd2a 100644
--- a/main/exercice/calculated_answer.class.php
+++ b/main/exercice/calculated_answer.class.php
@@ -234,7 +234,7 @@ class CalculatedAnswer extends Question
                 }
                 $this->save();
                 $objAnswer = new Answer($this->id);
-                $objAnswer->createAnswer($auxAnswer, 1, '', $this->weighting, null);
+                $objAnswer->createAnswer($auxAnswer, 1, '', $this->weighting, '');
                 $objAnswer->position = array();
                 $objAnswer->save();
             }