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From one moment to the other I cannot create any polygon anywhere on the map, independent from the layer I am in, even if I create a new shape-file. I have checked all snapping options, enabled them, disabled them completely, restarted everything, etc. but no matter what I do this message pops up:

The feature cannot be added because it's geometry collapsed due to intersection avoidance

It's super weird because even if I create it in absolutely blank space it tells me that the geometry collapsed. It occured when I had print composer open and modified a polygon. I moved the knots of one polygon and then wanted to create a new one which did not work. I checked the polygon of which I had moved the knots 400 times...there is no flaw and no intersection. Frustrating.

I am using QGIS 3.4 Madeira

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Managed to solve it myself. I had a disabled layer that encompassed the entire country (country contour). For some reason, maybe when testing out the snapping features a while ago "avoid intersection" was still enabled. The confusing point for me was that I had disabled snapping altogether so I had thought this would also disable all "avoid intersection" boxes that I had enabled in advanced snapping configurations. However I had to uncheck them individually even though snapping was turned off all together. Dont really know if this is intentional by the developers, but anyway. Lesson learned.

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    Thank you for self-answering! Many months from now someone else will have the same obscure problem, and they'll google "The feature cannot be added because it's geometry collapsed due to intersection avoidance" and find your Q&A, and it will make their day because you saved them hours of frustrating troubleshooting.
    – csk
    May 29, 2019 at 17:13
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    Yep. I fit exactly the description of the 'somebody else' here. QGis had been destroying my polygons all day without telling me. It has cost me hours, and your tip found the problem. Saviour, thanks!
    – PavliK
    Jun 15, 2021 at 22:49

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