How to check if ExecuteScalar returns NULL

Here's what I'm trying to do:
 
if (!cmd.ExecuteScalar().Equals(DBNull.Value))
return Int32.Parse(cmd.ExecuteScalar().ToString());
else
return 0;  But it keeps giving me an error, saying:

Object reference not set to an instance of an object.
The error is at the if statement when I'm doing cmd.ExecuteScalar().

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