This.grid.grid_sortable is undefined

I have created a child doctype and link it to a parent doctype. In the form of its parent doctype, when there are many rows of the child table, the filter/search text box appears, and when i input a value in the filter/search text box, i got this error in console:

‘Uncaught TypeError: this.grid.grid_sortable is undefined’

Screenshot from 2023-05-08 13-05-06

Please, if anyone know how to solve this,
thank you very much!