In crystal report when we are generating range report with grouping t this point of time it will generate last page that is blank except for the page footer (which indicates the current page, as well as the report title).
This only occurs when the data displayed on the second last page completely fills the page.
To solve use this solution steps,
1.Right click on select report Group Footer section
2.Select Section Export…
3.Select paging tab.
4.Check New page after and click in formula button next to it.
5. type NOT OnLastRecord (You can use copy and paste also)
That’s it your problem solved..