TGEA 1.7.1 Bug : Can not enable dynamic cubemap

I enable the dynamic cubemap as following code:

new Material(ammo_mat)
{
mapTo = "clip";
texture[0] = "clip";
dynamicCubemap = true;

};


datablock StaticShapeData(test)
{
category = "Demo";
shapeFile = "~/data/shapes/crossbow/ammo.dts";
dynamicReflection = true;
};

but engine crash at void ShapeBase::updateReflection()

any idea about this issue? Testing in Pure TGEA 1.7.1 and AFX1.12_TGEA1.71. any help are welcome.