FIT0708 - 8mm BiPolar Linear Stepper - Torque problem

Hi,

I am working with one of these FIT0708 - 8mm BiPolar Linear Stepper with an Arduino UNO using the Stepper.h library. https://www.dfrobot.com/search-fit0708.html

The problem I am having is… that as soon as there is any resistance, the motor stops.

Is there anyway to change this?