Index: trac/ticket/report.py
===================================================================
--- trac/ticket/report.py	(revision 7021)
+++ trac/ticket/report.py	(working copy)
@@ -547,23 +547,19 @@
             self.env.log.debug("Colnum Names %s, Sort column %s" %
                                (str(cols), sort_col))
             order_cols = []
-            try:
-                group_idx = cols.index('__group__')
-                order_cols.append(str(group_idx))
-            except ValueError:
-                pass
+            if '__group__' in cols:
+                order_cols.append('__group__')
 
             if sort_col:
-                try:
-                    sort_idx = cols.index(sort_col) + 1
-                    order_cols.append(str(sort_idx))
-                except ValueError:
+                if sort_col in cols:
+                    order_cols.append(sort_col)
+                else:
                     raise TracError(_('Query parameter "sort=%(sort_col)s" '
                                       ' is invalid', sort_col=sort_col))
 
             # The report-query results is obtained
             asc_str = ['DESC', 'ASC']
-            asc_idx = int(req.args.get('asc','0'))
+            asc_idx = int(req.args.get('asc','1'))
             order_by = ''
             if len(order_cols) != 0:
                 dlmt = ", "