jQuery Grid Plugin - jqGrid

Hello, I  found some problematic behavior when we use subgrid. 

First example:

- select all rows with top checkbox

- click "delete" icon

- post data sent to server is id:18,19,20,21,22,23,24,74,75,76 – this is good

Second example:

- expand some of rows

- select all rows with top checkbox

- click "delete" icon

- post data sent to server is id:18,,19,20,21,22,23,24,74,75,76 - there is expanded row taken into account with empty id.

So, empty statement breaks SQL query on server.

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jQGrid version 3.x and 4.x is affected.

Best regards 

Piotr