scrollToIfNecessary sets bottomBound as NaN

In ui-grid - v3.0.0-rc.22 I am trying to execute the scrollTo functionality. When I hit line 5280:

var bottomBound = self.renderContainers.body.prevScrollTop + self.gridHeight - self.renderContainers.body.headerHeight - self.footerHeight - self.scrollbarWidth;

the value for 'self.renderContainers.body.headerHeight' is undefined which causes the 'bottomBound' to be set to 'NaN'. It seems like the value used here should instead be 'self.headerHeight' which is used to set the 'topBound' on line 5270.

Am I either incorrect in that the value should be switched or am I doing something else that causes self.renderContainers.body.headerHeight to be 'undefined'?