Error : Please make a selection from the list to Delete

Hello,

My Joomla Version: 1.5.26

Component : Mighty Resource

When I want to delete a field from the fields list the deletion process will be completed up to field number : 151

From the Field number 152 up to the end of the field list the Delesion process says : "Please make a selection from the list to Delete"

and the Deletion process will not be completed .

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Thanks