Index: t3lib/class.t3lib_befunc.php
===================================================================
--- t3lib/class.t3lib_befunc.php	(revision 6491)
+++ t3lib/class.t3lib_befunc.php	(working copy)
@@ -3132,7 +3132,11 @@
 			while(list($kk, $vv) = each($fTWHERE_parts)) {
 				if ($kk) {
 					$fTWHERE_subpart = explode('###', $vv, 2);
-					$fTWHERE_parts[$kk] = $TSconfig['_THIS_ROW'][$fTWHERE_subpart[0]].$fTWHERE_subpart[1];
+					if ($fTWHERE_subpart[0] === 'uid' && !is_numeric($TSconfig['_THIS_ROW']['uid'])) {
+						$fTWHERE_parts[$kk] = '0' . $fTWHERE_subpart[1];
+					} else {
+						$fTWHERE_parts[$kk] = $TSconfig['_THIS_ROW'][$fTWHERE_subpart[0]] . $fTWHERE_subpart[1];
+					}
 				}
 			}
 			$fTWHERE = implode('', $fTWHERE_parts);