LPE Clone Original - Crash if delete one of clones

Steps to reproduce:

• open Inkscape
• draw rectangle - "Original"
• select and make two clones with LPE (Edit/clone/Clone with LPE)
• delete clone 1 in the object manager
• Select "original" again
• Path > Object to the path / or change geometry in any other way

What happened?

CRASH

What should have happened?

not crash

Inkscape Version and Operating System:

• Inkscape Version: 1,0 RC
• Operating System: win 10
• Operating System version: 1909

Console output

> ** (org.inkscape.Inkscape:9252): WARNING **: 13:47:36.431: Fonts dir 'C:\Users\BlackTank\AppData\Roaming\inkscape\fonts' does not exist and will be ignored.
> 
> (org.inkscape.Inkscape:9252): Gtk-WARNING **: 13:47:39.908: Drawing a gadget with negative dimensions. Did you forget to allocate a size? (node notebook owner GdlSwitcher)
> 
> (org.inkscape.Inkscape:9252): Gtk-WARNING **: 13:47:39.923: Drawing a gadget with negative dimensions. Did you forget to allocate a size? (node stack owner GdlSwitcher)
> 
> (org.inkscape.Inkscape:9252): Gtk-CRITICAL **: 13:47:39.973: gtk_box_gadget_distribute: assertion 'size >= 0' failed in GdlSwitcher
> (repeats a lot more times)
> ** (org.inkscape.Inkscape:9252): CRITICAL **: 13:48:00.880: void SPObject::requestModified(unsigned int): assertion 'this->document != nullptr' failed
> 
> (org.inkscape.Inkscape:9252): Gtk-CRITICAL **: 13:48:00.914: gtk_box_gadget_distribute: assertion 'size >= 0' failed in GdlSwitcher
> (repeats a lot more times)
> Emergency save activated!
> 
> Emergency save document locations:
>   C:\Users\BlackTank\New document 1.2020_04_18_13_48_12.0.svg
> Emergency save completed. Inkscape will close now.
> If you can reproduce this crash, please file a bug at https://inkscape.org/report
> with a detailed description of the steps leading to the crash, so we can fix it.
> 
> (org.inkscape.Inkscape:9252): Gtk-CRITICAL **: 13:48:12.872: gtk_box_gadget_distribute: assertion 'size >= 0' failed in GdlSwitcher
> (repeats a few more times)