Why always Warning: mysql_fetch_object (): suppliedargumentisnotavalidMySQLresul

Why always Warning: mysql_fetch_object (): Warning why always Warning: & nbsp; mysql_fetch_object (): & nbsp; supplied & nbsp; why is argume always Warning: mysql_fetch_object (): supplied argument is not a valid MySQL resul
Why is it always

Warning: mysql_fetch_object (): supplied argument is not a valid MySQL result resource in D: \ AppServ1 \ www \ forum \ index. php on line 46


Code:
$ Id = $ row ["id"];
$ Res = mysql_query ("select count (*) as total from reply where topic id = '$ ID '");
$ R = mysql_fetch_object ($ res );
Help
------ Solution --------------------
Topic id = '$ ID' "// The error message is returned.
------ Solution --------------------
You can run the SQL statement in MYSQL to check whether there are any results.
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Concatenate the last $ id with a hyphen. do not write it directly into SQL.
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If the topic is another table, you must use the join query or multi-table match query.