Editing campgaign page leads to "encountered unexpected error" (Call to a member function getValue() on null)

[leeomara]

Content editor was getting crashes when developing a Campaign page.

The precise conditions to reproduce this issue are not yet known.

Watchdog reports this error:

Error: Call to a member function getValue() on null in yukonca_glider_preprocess_page() (line 568 of docroot/themes/custom/yukonca_glider/yukonca_glider.theme).

Another watchdog entry (warning), which might be related:

Warning: Attempt to read property "field_child_campaign_pages" on null in yukonca_glider_preprocess_page() (line 568 of docroot/themes/custom/yukonca_glider/yukonca_glider.theme)

In our UAT this error was reported for https://yukon.cms-uat.yukon.ca/en/steering-committee

More details about what might have "fixed" it:

The only difference was linking the child page to the parent page. Once I connected the campaign page to the campaign ‘site’ and clicked on the steering committee page from there, I was able to edit and save the page.

Reported by ECO.

[leeomara]

I created a new test Campaign page in UAT and encountered no error.