Bug: Importing entries with matrix in matrix fails, even if import is set to not import any matrix fields.

[ZapaNOR]

Description

I have an entry type that contains a matrix field, with a sub matrix field (matrix in matrix).
This field is not set to be imported at all, and the Feed Me mapping just says "matrix in matrix is not currently supported" anyways.

But, trying to import any entries will give the error:
foreach() argument must be of type array|object, null given - Matrix.php: 284.

It seems Feed Me somehow "checks" or tries to do something with this matrix field anyways, and throws an error without importing any data.

Removing the matrix field, and resaving the import fixes the problem and entries are imported correctly.

Steps to reproduce

1. Create entry with matrix in matrix field.
2. Set up import to create entries, just as simple sa importing with title.

Additional info

• Craft version: 5.6.13
• Plugins & versions: Feed Me - 6.8.0

[ZapaNOR]

Update: setting the "Section" field to disabled solves the problem.
Maybe this is by design, but not very intuitive.

[i-just]

Hi, thanks for reporting!

setting the "Section" field to disabled solves the problem. Maybe this is by design, but not very intuitive.

That’s a workaround, but you shouldn’t have to do that. It’s a bug.

I can reproduce it when the entry type for the “outer” matrix contains only matrix fields and nothing else: no title, no slug, no other fields; if I add at least one of those and resave the mapping screen, it all starts working as expected.

I raised a PR for this.

[angrybrad]

Fixed in #1622 and will be included in the next releases!