Index: importsurvey.php
===================================================================
--- importsurvey.php	(revision 8829)
+++ importsurvey.php	(working copy)
@@ -1680,7 +1680,7 @@
 {
     global $connect, $dbprefix;
     $isresult = $connect->GetOne("SELECT sid FROM {$dbprefix}surveys WHERE sid=$oldsid");
-    if (!is_null($isresult))
+    if (false !== $isresult)
     {
         // Get new random ids until one is found that is not used
         do
@@ -1688,7 +1688,7 @@
             $newsid = getRandomID();
             $isresult = $connect->GetOne("SELECT sid FROM {$dbprefix}surveys WHERE sid=$newsid");
         }
-        while (!is_null($isresult));
+        while (false !== $isresult);
         return $newsid;
     }
     else