Could session use Class?

From: Date: Thu, 12 Aug 1999 02:52:16 +0000
Subject: Could session use Class?
References: 1  Groups: php.version4 
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When I use class with session, sometimes it print: "Warning: Unserializing non-existant class: stdClass! No methods will be available!" What does it mean? Can I use class with session?

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