Index: branches/RC/core/kernel/kbase.php
===================================================================
diff -u -N -r10294 -r10994
--- branches/RC/core/kernel/kbase.php	(.../kbase.php)	(revision 10294)
+++ branches/RC/core/kernel/kbase.php	(.../kbase.php)	(revision 10994)
@@ -335,8 +335,13 @@
 	function replaceModePrefix($query)
 	{
 		$live_table = substr($this->Application->GetLiveName($this->TableName), strlen(TABLE_PREFIX));
-		preg_match('/'.preg_quote(TABLE_PREFIX, '/').'(.*)'.preg_quote($live_table, '/').'/', $this->TableName, $rets);
-		return str_replace('%3$s', $rets[1], $query);
+		if (preg_match('/'.preg_quote(TABLE_PREFIX, '/').'(.*)'.preg_quote($live_table, '/').'/', $this->TableName, $rets)) {
+			// will only happen, when table has a prefix (like in K4)
+			return str_replace('%3$s', $rets[1], $query);
+		}
+
+		// will happen, when K3 table without prefix is used
+		return $query;
 	}
 
 	/**