Unable to start message center due to crash

[daniele-athome]

Android 6.0 from Crashlytics.

java.lang.RuntimeException: Unable to start service org.kontalk.service.msgcenter.MessageCenterService@73b8f57 with Intent { act=org.kontalk.action.MESSAGE cmp=org.kontalk/.service.msgcenter.MessageCenterService (has extras) }: java.lang.IllegalStateException: no encryption methods specified
       at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3045)
       at android.app.ActivityThread.-wrap17(ActivityThread.java)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1452)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5443)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by java.lang.IllegalStateException: no encryption methods specified
       at org.spongycastle.openpgp.PGPEncryptedDataGenerator.open(PGPEncryptedDataGenerator.java:178)
       at org.spongycastle.openpgp.PGPEncryptedDataGenerator.open(PGPEncryptedDataGenerator.java:333)
       at org.kontalk.crypto.PGPCoder.encryptData(PGPCoder.java:174)
       at org.kontalk.crypto.PGPCoder.encryptStanza(PGPCoder.java:137)
       at org.kontalk.service.msgcenter.MessageCenterService.sendMessage(MessageCenterService.java:2454)
       at org.kontalk.service.msgcenter.MessageCenterService.handleMessage(MessageCenterService.java:1117)
       at org.kontalk.service.msgcenter.MessageCenterService.handleIntent(MessageCenterService.java:897)
       at org.kontalk.service.msgcenter.MessageCenterService.onStartCommand(MessageCenterService.java:703)
       at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3028)
       at android.app.ActivityThread.-wrap17(ActivityThread.java)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1452)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5443)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)