diff --git a/question/type/ordering/question.php b/question/type/ordering/question.php
index 1843beea3a4..ae049ff991a 100644
--- a/question/type/ordering/question.php
+++ b/question/type/ordering/question.php
@@ -651,6 +651,11 @@ class qtype_ordering_question extends question_graded_automatically {
                     $prependsubset = true;
                     $appendtosubset = true;
                     break;
+
+                default: // shouldn't happen !!
+                    $tailsets = array();
+                    $prependsubset = false;
+                    $appendtosubset = false;
             }
 
             // Append any $tailsets that were found.
diff --git a/question/type/ordering/version.php b/question/type/ordering/version.php
index 3658754ecad..ce83101c9db 100644
--- a/question/type/ordering/version.php
+++ b/question/type/ordering/version.php
@@ -29,5 +29,5 @@ $plugin->cron      = 0;
 $plugin->component = 'qtype_ordering';
 $plugin->maturity  = MATURITY_STABLE;
 $plugin->requires  = 2011070100; // Moodle 2.1.
-$plugin->version   = 2016050252;
-$plugin->release   = '2016-05-02 (52)';
+$plugin->version   = 2016051153;
+$plugin->release   = '2016-05-11 (53)';