App stops drawing when I delete section and try to delete Row aftewards

Using: SDK 3.2.3 IOS: 7.1

I have a table View with sections and rows, after the UI has been rendered I wanna delete some sections and rows.

But when I call the function deleteRow after I called function deleteSection, the View stopped to be rendered and no other operation is possible on tableview.

I can call either deleteSection or deleteRow calling both in a row raise this issue.

Please let me know if you need a code sample