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java.lang.IllegalArgumentException: null	at java.nio.ByteBuffer.allocate(ByteBuffer.java:334)	at com.mongodb.internal.connection.PowerOfTwoBufferPool.createNew(PowerOfTwoBufferPool.java:84)	at com.mongodb.internal.connection.PowerOfTwoBufferPool.getBuffer(PowerOfTwoBufferPool.java:76)	at com.mongodb.connection.SocketStream.getBuffer(SocketStream.java:69)	at com.mongodb.connection.InternalStreamConnection.getBuffer(InternalStreamConnection.java:511)	at com.mongodb.connection.UsageTrackingInternalConnection.getBuffer(UsageTrackingInternalConnection.java:89)	at com.mongodb.connection.DefaultConnectionPool$PooledConnection.getBuffer(DefaultConnectionPool.java:417)	at com.mongodb.connection.ByteBufferBsonOutput.getByteBufferAtIndex(ByteBufferBsonOutput.java:89)	at com.mongodb.connection.ByteBufferBsonOutput.getCurrentByteBuffer(ByteBufferBsonOutput.java:84)	at com.mongodb.connection.ByteBufferBsonOutput.writeByte(ByteBufferBsonOutput.java:73)	at org.bson.io.OutputBuffer.write(OutputBuffer.java:150)	at org.bson.io.OutputBuffer.writeInt32(OutputBuffer.java:59)	at org.bson.io.OutputBuffer.writeInt(OutputBuffer.java:160)	at org.bson.io.OutputBuffer.writeString(OutputBuffer.java:89)	at org.bson.BsonBinaryWriter.doWriteString(BsonBinaryWriter.java:262)	at org.bson.AbstractBsonWriter.writeString(AbstractBsonWriter.java:548)	at org.bson.codecs.StringCodec.encode(StringCodec.java:31)	at org.bson.codecs.StringCodec.encode(StringCodec.java:28)	at com.mongodb.DBObjectCodec.writeValue(DBObjectCodec.java:211)	at com.mongodb.DBObjectCodec.encodeMap(DBObjectCodec.java:220)	at com.mongodb.DBObjectCodec.writeValue(DBObjectCodec.java:196)	at com.mongodb.DBObjectCodec.encodeIterable(DBObjectCodec.java:269)	at com.mongodb.DBObjectCodec.writeValue(DBObjectCodec.java:198)	at com.mongodb.DBObjectCodec.encode(DBObjectCodec.java:128)	at com.mongodb.DBObjectCodec.encode(DBObjectCodec.java:61)	at com.mongodb.CompoundDBObjectCodec.encode(CompoundDBObjectCodec.java:48)	at com.mongodb.CompoundDBObjectCodec.encode(CompoundDBObjectCodec.java:27)	at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:63)	at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)	at com.mongodb.connection.InsertCommandMessage.writeTheWrites(InsertCommandMessage.java:101)	at com.mongodb.connection.InsertCommandMessage.writeTheWrites(InsertCommandMessage.java:43)	at com.mongodb.connection.BaseWriteCommandMessage.encodeMessageBodyWithMetadata(BaseWriteCommandMessage.java:129)	at com.mongodb.connection.RequestMessage.encodeWithMetadata(RequestMessage.java:160)	at com.mongodb.connection.WriteCommandProtocol.sendMessage(WriteCommandProtocol.java:212)	at com.mongodb.connection.WriteCommandProtocol.execute(WriteCommandProtocol.java:101)	at com.mongodb.connection.InsertCommandProtocol.execute(InsertCommandProtocol.java:67)	at com.mongodb.connection.InsertCommandProtocol.execute(InsertCommandProtocol.java:37)	at com.mongodb.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:159)	at com.mongodb.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:286)	at com.mongodb.connection.DefaultServerConnection.insertCommand(DefaultServerConnection.java:115)	at com.mongodb.operation.InsertOperation.executeCommandProtocol(InsertOperation.java:76)	at com.mongodb.operation.BaseWriteOperation$1.call(BaseWriteOperation.java:141)	at com.mongodb.operation.BaseWriteOperation$1.call(BaseWriteOperation.java:133)	at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:230)	at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:221)	at com.mongodb.operation.BaseWriteOperation.execute(BaseWriteOperation.java:133)	at com.mongodb.operation.BaseWriteOperation.execute(BaseWriteOperation.java:60)	at com.mongodb.Mongo.execute(Mongo.java:781)	at com.mongodb.Mongo$2.execute(Mongo.java:764)	at com.mongodb.DBCollection.executeWriteOperation(DBCollection.java:333)	at com.mongodb.DBCollection.insert(DBCollection.java:328)