Reset session correctly

Sometimes logging in doesn't work correctly, fix it.

src/lua/session.lua

@@ -30,6 +30,7 @@ function session.get(req)
 	}
 	local err = util.do_sql(stmnt_get_session)
 	if err ~= sql.ROW then
+		stmnt_get_session:reset()
 		return nil, "No such session by logged in users"
 	end
 	local data = stmnt_get_session:get_values()