[fprint] Problem with Async API: program crashing if I put my finger to scanner for long time

[Nicholas Shatokhin]

I'm creating fprint qt4 library:  
https://github.com/NicholasShatokhin/fprint_qt

It's working good but it has one problem. If I put my finger on scanner  
(AES1610) for a few seconds (in two-three times longer that it need for  
swiping) program crashes. What's wrong? I use async API and watched how it  
using in fprint_demo. In synchronous API this problem not exists. In  
fprint_demo too. But my program crashes. Please, help me, it's very  
difficult for me to read gtk+ code so I can't find solution by myself.

Best regards,
Nick.

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