Invalid prop warning in Learner > Library > Category

[sairina]

Observed behavior

When in Learner > Library, and I click on "Categories" in the side panel, there is a warning in the console that pops up for anything that is not "All categories" or "None of the above":
Invalid prop: type check failed for prop "span". Expected String with value "4", got Number with value 4. for

Errors and logs

Expected behavior

No errors would show up in console.

User-facing consequences

Cluttered console

Steps to reproduce

1. Sign in as learner
2. Click on Library
3. Open the console in browser
4. Under "Category," click on anything other than "All categories" or "None of the above"

Context

• Kolibri v0.15.x
• Chrome

[rtibbles]

Note that this is likely :span="4" being passed instead of span="4" to a KGridItem component.