Minecraft PE 0.14.3 on Android crashes on our server

Our server, mine.codelabs.ru:19132, currently has a map which causes clients to crash. Looks like it started to do so after a wolf egg was placed there.

Server restarts, client device reloads – tried all. Server is running Nukkit "master" version.

Tried hardware:

• Huawei Honor 6 Marshmallow;
• Huawei Y5C, Android 4.4.2;
• Asus MeMO pad, 4.4.

You can try to log in to our server by yourself and, I hope, will be able to debug the issues. If you'll tell, how to turn on tracebacks or debug mode at our clients devices for Minecraft PE – we'll try to do that ourselves and report our findings.

Thanks a lot!