SQLite: database is locked

[daniele-athome]

SQLiteDatabaseLockedException: database is locked (code 5): , while compiling: SELECT public_key, trust_level, manual_trust FROM keys WHERE ((trust_level >= 0 AND fingerprint <> ?) AND (jid=? COLLATE NOCASE)) ORDER BY timestamp DESC
       at io.requery.android.database.sqlite.SQLiteConnection.nativePrepareStatement(SQLiteConnection.java)
       at io.requery.android.database.sqlite.SQLiteConnection.acquirePreparedStatement + 938(SQLiteConnection.java:938)
       at io.requery.android.database.sqlite.SQLiteConnection.prepare + 541(SQLiteConnection.java:541)
       at io.requery.android.database.sqlite.SQLiteSession.prepare + 598(SQLiteSession.java:598)
       at io.requery.android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:60)
       at io.requery.android.database.sqlite.SQLiteQuery.(SQLiteQuery.java:41)
       at io.requery.android.database.sqlite.SQLiteDirectCursorDriver.query + 44(SQLiteDirectCursorDriver.java:44)
       at io.requery.android.database.sqlite.SQLiteDatabase.rawQueryWithFactory + 1451(SQLiteDatabase.java:1451)
       at io.requery.android.database.sqlite.SQLiteQueryBuilder.query + 400(SQLiteQueryBuilder.java:400)
       at io.requery.android.database.sqlite.SQLiteQueryBuilder.query + 295(SQLiteQueryBuilder.java:295)
       at org.kontalk.provider.UsersProvider.query + 433(UsersProvider.java:433)
       at android.content.ContentProvider.query + 1017(ContentProvider.java:1017)
       at android.content.ContentProvider$Transport.query + 238(ContentProvider.java:238)
       at android.content.ContentResolver.query + 502(ContentResolver.java:502)
       at android.content.ContentResolver.query + 438(ContentResolver.java:438)
       at org.kontalk.provider.Keyring.queryLatestWithMinimumTrustLevel + 231(Keyring.java:231)
       at org.kontalk.provider.Keyring.getPublicKeyData + 197(Keyring.java:197)
       at org.kontalk.provider.Keyring.getPublicKey + 178(Keyring.java:178)
       at org.kontalk.service.msgcenter.MessageCenterService$11.run + 1814(MessageCenterService.java:1814)
       at java.lang.Thread.run + 833(Thread.java:833)

I'll enable writeAheadLogging.