Rails server got stuck when wicket PDF is used

If I run in debug mode a rails server, and some actions process a PDF using wicket pdf the log show this message in red letters:

Fast Debugger (ruby-debug-ide 0.7.0.beta4, debase 0.2.2, file filtering is supported) listens on 0.0.0.0:55880

And the application got stuck.

 

Any idea what can be?

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