4.2.1 JET / mobile scheduler - this._master_size is undefined

Hello,

I have scheduler in webix jet. After upgrading from 4.1.0 to 4.2.1 (scheduler 4.2.0) I got following error:
TypeError: this._master_size is undefined at webix_debug.js:5692:3

workaround: add minWidth to scheduler view;

Hello,

Unfortunately, we could not reproduce the issue. Could you please share some snippet that demonstrates it?