Crash when opening SVG file with dangling feBlend or feFlood filters

[André GILLIBERT]

Any SVG file produced by the SAS (Statistical Analysis System) 9.3 statistical software, crashes Inkscape 0.92.1 when open.
This can be reduced to a bug on dangling filters. It may be invalid, but it should not crash Inkscape.

Steps to reproduce :
1) Install Inkscape 0.92.1 on Windows 7 64 bits (not tested on other systems)
2) Create a bug.svg file containing the following code:

<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<feBlend></feBlend>
</svg>

3) Open this SVG file with Inkscape

It produces this error message and closes immediately :
---------------------------
Microsoft Visual C++ Runtime Library
---------------------------
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
---------------------------

Expected behavior : Open Inkscape with a blank page.

Same bug for the following file:

<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<feFlood></feFlood>
</svg>

[Alvin Penner (apenner)]

confirmed on Windows 10, Inkscape 0.92.1 r15371, using the code:

<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
 <feBlend></feBlend>
 </svg>

the crash message is:
ERROR:E:\Temp\Inkscape\0.92.1\inkscape-0.92.1_32\src\sp-namedview.cpp:1068:SPNamedView* sp_document_namedview(SPDocument*, const gchar*): assertion failed: (nv != NULL)

the crash can be avoided by wrapping the feBlend in a <filter> tag, as shown in the attachewd file, which does not crash.

[Nathan Lee (nathan.lee)]

Hi - thanks for reporting this bug, I've manually migrated it to Inkscape's new bug tracker on GitLab, and closed it here. You can continue tracking the issue in https://gitlab.com/inkscape/inkscape/-/issues/2685

Please feel free to file new bugs about the issues you're seeing at
http://inkscape.org/report.