Crash on clicking play on audio messages

[daniele-athome]

This AudioFragment thing is making me crazy...

java.lang.NullPointerException
       at org.kontalk.ui.AbstractComposeFragment.playAudio(AbstractComposeFragment.java:2132)
       at org.kontalk.ui.AbstractComposeFragment.buttonClick(AbstractComposeFragment.java:2078)
       at org.kontalk.ui.view.AudioContentView.onClick(AudioContentView.java:145)
       at android.view.View.performClick(View.java:4442)
       at android.view.View$PerformClick.run(View.java:18473)
       at android.os.Handler.handleCallback(Handler.java:733)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:136)
       at android.app.ActivityThread.main(ActivityThread.java:5103)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:515)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:606)
       at dalvik.system.NativeStart.main(NativeStart.java)