Index: t3lib/class.t3lib_befunc.php
===================================================================
--- t3lib/class.t3lib_befunc.php	(revision 3551)
+++ t3lib/class.t3lib_befunc.php	(working copy)
@@ -2780,9 +2780,17 @@
 		$fTWHERE = $fieldValue['config'][$prefix.'foreign_table_where'];
 		if (strstr($fTWHERE,'###REC_FIELD_'))	{
 			$fTWHERE_parts = explode('###REC_FIELD_',$fTWHERE);
-			while(list($kk,$vv)=each($fTWHERE_parts))	{
+			
+			foreach($fTWHERE_parts as $kk => $vv)	{
 				if ($kk)	{
 					$fTWHERE_subpart = explode('###',$vv,2);
+						// For new records, which are not saved yet, $TSconfig['_THIS_ROW'][$fTWHERE_subpart[0]] may be empty.
+						// This will cause SQL errors until the record has been saved for the first time.
+						// Setting the value to 0 if it is empty.
+						// @TODO: Needs a better fix.
+					if (empty($TSconfig['_THIS_ROW'][$fTWHERE_subpart[0]]))	{
+						$TSconfig['_THIS_ROW'][$fTWHERE_subpart[0]] = 0;
+					}
 					$fTWHERE_parts[$kk]=$TSconfig['_THIS_ROW'][$fTWHERE_subpart[0]].$fTWHERE_subpart[1];
 				}
 			}