Bug report

Regression introduced in R3 2020.

Reproduction of the problem

Reproducible in the demos. Video attached.
Recording47.zip

1. Run the "overview" demo and open the browser devtools console.
2. In the treelist, drag the first task upwards until the "k-i-insert-middle" drag clue appears. The cursor should be positioned just under the treelist header.
3. Drop the task

Current behavior

A js exception is thrown:

kendo.all.js:126843 Uncaught TypeError: Cannot read property 'orderId' of null

Expected/desired behavior

No exceptions are thrown.

Environment

• **Kendo UI version: 2020.3.1118
• jQuery version: x.y
• Browser: [all]