Crash when applying new path effect after deleting pattern of Pattern-along-path LPE

Please add information about Inkscape version (see Inkscape menu 'Help > About Inkscape') to the bug description.

It would also be helpful for further investigations if you could attach a simple test case (SVG file) to the bug report, and more detailed 'steps to reproduce'.

Hello,

My version is 0.91
I join the svg file, and some screenshots about this error, maybe it'll be helpfull?

SVG file before the crash and the errors messages :

http://up.sur-la-toile.com/i1eZf
http://up.sur-la-toile.com/i1eZg
http://up.sur-la-toile.com/i1eZh

Thanks for your answer!

Could you please give detailed steps that we could follow to reproduce the crash starting with you attached file?
My tests with 0.91 and trunk rev. 13950 on Windows XP (32bits) show nothing wrong so far.

Nice cat, BTW ;)

Hello,

not my cat :P
I'm running actually on Windows 7 SP1 64 bits, all updates ok, Inkscape 0.91 r13725 ;

-Draw a circle with the circle tool
-convert it in path
-draw now a triangle with the path tool, no stroke, fill it in black 100%
-copy to clipboard the triangle (you can now delete the triangle, or if you like triangles, let him alive!)
-next select the circle
-go to path effects (Ctrl+Shift+7), add a new effect ->Pattern along path -> add.

Next, select the effect, paste clipboard to your effect (wow it's beautifull!)
-Then select all triangle nodes, delete them.
-Deselect and reselect the modified circle
-Try to add a new path effect (work on all path effects) to the circle, and you got this error.

Done.

Is it more clear? I'm sorry if I ommited details.

Crash reproduced as described with Inkscape 0.91 r13725 and Inkscape 0.91+devel r14192 on OS X 10.7.5.

Console message:
(inkscape:61731): glibmm-ERROR **:
unhandled exception (type std::exception) in signal handler:
what: basic_string::_S_construct NULL not valid

(did not manage to produce a meaningful backtrace though)

--
Replaces comment #6 (now hidden) to fix typo in revno

Also reproduced on Windows XP and Xubuntu 15.04, Inkscape trunk re. 14206.
Not reproduced with 0.48.5.

Raising bug importance (no emergency save file is created -> loss of data).

This patch fix the problem

Patch tested (almost) successfully on Windows 7, Inkscape trunk rev. 14707 (32-bit).

Compared to the original bug, the patched version resets the LPE to its initial values. So if you set Edit-on-canvas, you can see two nodes at the top-left of the page.
Now if you delete the two initial nodes and try to apply a new effect, Inkscape crashes as in the original description.
Tell me if you want me to create a new report for the remaining issue.

Thanks for try it. I go to fix it!

Nod need to new report. I fix it here

This fix the bug.

Patch tested successfully on Xubuntu 15.10, Inkscape trunk rev. 14712.

The default nodes are now recreated automatically when deleted, and the Inkscape no longer crashes.
Thanks!

Thanks to you for check it. I merge it tonight.

Fixed in r.14717