[FLOW3-general] You cannot serialize or unserialize PDO instances

[Heiko Kromm | Paints]

Hi List, 

sometimes I get this error message: 
You cannot serialize or unserialize PDO instances 

It's thrown from: 
FLOW3/Data/Temporary/Development/Cache/Code/FLOW3_Object_Classes/TYPO3_FLOW3_Session_PhpSession_Original.php in line 276 

After the error has been thrown I will get this error message on every controller and action I call. 
I have to clear the data in Temporary/Development to get my application working again. 

Unfortunatly I'm not able to reproduce this error. 
Did anyone else came up with this? 

Regards 
Heiko