Index: t3lib/class.t3lib_befunc.php
===================================================================
--- t3lib/class.t3lib_befunc.php	(revision 5678)
+++ t3lib/class.t3lib_befunc.php	(working copy)
@@ -3053,10 +3053,16 @@
 		$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)) {
-				if ($kk) {
-					$fTWHERE_subpart = explode('###', $vv, 2);
-					$fTWHERE_parts[$kk] = $TSconfig['_THIS_ROW'][$fTWHERE_subpart[0]].$fTWHERE_subpart[1];
+			foreach($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.
+					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];
 				}
 			}
 			$fTWHERE = implode('', $fTWHERE_parts);