[okular] [Bug 408000] New: okular crashes when opening a large epub file

[LiTuX]

https://bugs.kde.org/show_bug.cgi?id=408000

            Bug ID: 408000
           Summary: okular crashes when opening a large epub file
           Product: okular
           Version: 1.7.1
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: EPub backend
          Assignee: okular-devel at kde.org
          Reporter: LiTuX at live.com
  Target Milestone: ---

Created attachment 120344
  --> https://bugs.kde.org/attachment.cgi?id=120344&action=edit
Output of okular when opening KritaManual.epub

SUMMARY
I've noticed that there are several similar bugs. I can confirm that some of
them have been fixed and some are not. Now I've download a large epub file
(about 74M, the krita manual), and okular always crash when I try to open it.

STEPS TO REPRODUCE
1. wget https://docs.krita.org/en/epub/KritaManual.epub
2. okular KritaManual.epub

OBSERVED RESULT
libepub (II): opening 'KritaManual.epub'
...
Error: no block found for  "file_formats/file_exr.xhtml"
Error: no block found for  "colors/linear_and_gamma.xhtml"
Error: no block found for  "blending_modes/mix.xhtml#bm-erase"
Error: no block found for  "projection/axonometric.xhtml"
libepub (II):   ../_images/Krita_2_9_brushengine_colorrate_04.png - No such
file
libepub (II):   ../_images/Krita_2_9_brushengine_colorrate_04.png - No such
file
libepub (II):   ../_images/Krita_2_9_brushengine_colorrate_04.png - No such
file
libepub (II):   ../_images/Krita_2_9_brushengine_colorrate_04.png - No such
file

[1]    2534 segmentation fault (core dumped)  okular KritaManual.epub >
okular-kritamanual.log 2>&1

See attachment for detailed output of okular

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Manjaro Linux, kernel 4.19.45-1-MANJARO
(available in About System)
KDE Plasma Version: 5.15.5
KDE Frameworks Version: 5.58.0
Qt Version: 5.12.3

ADDITIONAL INFORMATION
On my computer, the attached epub file in bug #406738 also crashed okuar.

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