diff --git a/main/exercice/exercise.class.php b/main/exercice/exercise.class.php
index 84600065fb..56f69098d6 100644
--- a/main/exercice/exercise.class.php
+++ b/main/exercice/exercise.class.php
@@ -2365,6 +2365,9 @@ class Exercise {
 						} else {
 							$totalScore+= $questionScore;
 						}
+                        if ($questionScore == '') {
+                            $questionScore = 0;
+                        }
 						$arrques = $questionName;
 						$arrans  = $choice;
 					} else {