Index: t3lib/class.t3lib_db.php
===================================================================
--- t3lib/class.t3lib_db.php	(revision 4024)
+++ t3lib/class.t3lib_db.php	(working copy)
@@ -395,29 +395,30 @@
 
 			// Table and fieldnames should be "SQL-injection-safe" when supplied to this function (contrary to values in the arrays which may be insecure).
 		if (is_string($where))	{
-			if (is_array($fields_values) && count($fields_values))	{
 
+			$fields = array();
+			if (is_array($fields_values))	{
+
 					// quote and escape values
 				$nArr = $this->fullQuoteArray($fields_values,$table,$no_quote_fields);
 
-				$fields = array();
 				foreach ($nArr as $k => $v) {
 					$fields[] = $k.'='.$v;
 				}
-
-					// Build query:
-				$query = 'UPDATE '.$table.'
-					SET
-						'.implode(',
-						',$fields).
-					(strlen($where)>0 ? '
-					WHERE
-						'.$where : '');
-
-					// Return query:
-				if ($this->debugOutput || $this->store_lastBuiltQuery) $this->debug_lastBuiltQuery = $query;
-				return $query;
 			}
+				// Build query:
+			$query = 'UPDATE '.$table.'
+				SET
+					'.implode(',
+					',$fields).
+				(strlen($where)>0 ? '
+				WHERE
+					'.$where : '');
+			if ($this->debugOutput || $this->store_lastBuiltQuery) $this->debug_lastBuiltQuery = $query;
+				// For backwards compatibility we return false if no fields were given
+			if (!count($fields)) $query = false;
+				// Return query:
+			return $query;
 		} else {
 			die('<strong>TYPO3 Fatal Error:</strong> "Where" clause argument for UPDATE query was not a string in $this->UPDATEquery() !');
 		}