Check for empty text strings. Thanks to Quedoc.

diff --git a/question/format/xml/format.php b/question/format/xml/format.php
index 6c657d63a05903c6d6ba3e3a219707c1ce6e0175..2b0b66280219a5087b6fb720a08125cf0e306cc3 100755 (executable)
--- a/question/format/xml/format.php
+++ b/question/format/xml/format.php
@@ -74,6 +74,10 @@ class qformat_xml extends qformat_default {
      * @return string processed text
      */
     function import_text( $text ) {
+        // quick sanity check
+        if (empty($text)) {
+            return '';
+        }
         $data = $text[0]['#'];
         return addslashes(trim( $data ));
     }