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I need to simplify the geometries of a large amount of polygons, yet every time I run the Simplify Geometries tool in QGIS, I get the error message below.

'NoneType' object has no attribute 'type' See log for more details

What is causing that error? How can I fix it?

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Use Select By Expression function with this expression

 $geometry IS NOT NULL

then use Simplify Geometries tool that apply the function only on 'Typed' geometries

Or remove your NULL geom if you want

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