Have been trying to debug this error for a little while now in Basic.

I see a few places where attributes.addClass(...) is being called and a comma separated string needs to be an array, but after chipping away at this for a bit, I'm still getting this error...

Warning: array_merge(): Argument #1 is not an array in Drupal\Core\Render\Element\RenderElement::setAttributes()

I'll post an update here in a little with more details.

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blue_waters created an issue. See original summary.

anthony.bouch’s picture

anthony.bouch CreditAttribution: anthony.bouch as a volunteer commented
Status: Active » Closed (works as designed)

My bad. It was one of our own blocks.