[Bugs] #3156 UNSP: error when collaborating

[Sugar Labs Bugs]

#3156: error when collaborating
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    Reporter:  erikos                     |          Owner:  godiard                    
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Memorize                   |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 - A: create a custom game with pictures

 - B: join it

 - play the game

 ---> on B when trying to flip the tile we get the following error

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3156>
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