Index: branches/release-41/php/lib/mtdb_base.php
===================================================================
--- branches/release-41/php/lib/mtdb_base.php (revision 2687)
+++ branches/release-41/php/lib/mtdb_base.php (revision 2708)
@@ -2701,6 +2701,8 @@
 
         # Adds an ID filter
-        if (isset($args['id']))
+        if ( isset($args['id']) ) {
+            if ( $args['id'] == '' ) return null;
             $id_filter = 'and asset_id = '.$args['id'];
+        }
 
         # Adds a days filter