Crash: Saving clip object with filter as PDF
#### Steps to reproduce:
- open Inkscape
- open attached file
- save copy as PDF
Alternatively
- open Inkscape
- create two objects
- apply a filter to the top object
- clip the bottom object to the top one (so the filter is not used)
- save as pdf
#### What happened?
It crashes
#### What should have happened?
Guess
#### Inkscape Version and Operating System:
- Inkscape Version:
* Inkscape 0.92.4 (f8dce91, 2019-08-02) snap
* Inkscape 0.92.4 (5da689c313, 2019-01-14) deb
- Operating System: ubuntu
- Operating System version: 19.10
Example file: [enfeitepotebolo.svg](/uploads/9a44ce60f774d710a34658eada9748f0/enfeitepotebolo.svg)
issue