Imported H5P Interactive Book fails to load after editing: JSON.parse: unexpected character at line 1 column 1 of the JSON data

[csidirop]

After importing an H5P Interactive Book export and subsequent editing, it is no longer loaded:

The browser console displays following error:

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
    base64ToJsonString https://ilias.uni-mannheim.de/Customizing/global/plugins/Services/Repository/RepositoryObject/H5P/templates/js/h5p.adapter.js?version=8_13&vers=8-13-0-03:140
    initContent https://ilias.uni-mannheim.de/Customizing/global/plugins/Services/Repository/RepositoryObject/H5P/templates/js/h5p.adapter.js?version=8_13&vers=8-13-0-03:120
    <anonymous> https://ilias.uni-mannheim.de/ilias.php?baseClass=ilobjplugindispatchgui&cmdNode=pj:nq:dw&cmdClass=ilH5PContentGUI&cmd=showContents&ref_id=1527245:1341
    addOnLoad https://ilias.uni-mannheim.de/Services/JavaScript/js/Basic.js?version=8_13&vers=8-13-0-03:47
    jQuery 13
ilias.php:1347:42

I can reproduce this behaviour on my own local instance with Ilias r_7 & r_8. Unfortunately, no entry is written to the log. This happens every time regardless how complex the IB is.

How to reproduce:

1. Create new IB
2. Add at least one content & save it & test if it works
3. Export it & delete it
4. Import it & test if it works
5. Edit the content and add eg. one additional page with one content element
6. Test it -> Error!

Its usually is enough to add one multiple choice or fill in the blanks task. And the same after importing it.

[otacke]

@csidirop That error is thrown in the ILIAS plugin. Since that H5P integration is not maintained by H5P Group, you should probably reach out to Studer&Raimann who built the plugin.

I am not ruling out an issue on H5P's side, in particular since Interactive Book has custom URL handling that doesn't comply fully with web standards. But that would be step #2.

[csidirop]

Okay I'll do that.

Ticket: SUPPORT-15209