Hello there @UcanAdamNacix!
Since EXCEPTION_ACCESS_VIOLATION are quite generic errors, there are multiple possible causes for this issue. We can take a few approaches for it:
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First, open your affected animation blueprint, and recompile it. If the process fails, try using Full Rebuild option.
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Next, check the specific foot placement node for any invalid or missing connections, look for any red indicators present, and reconnect them. You can also try reseting the node to default values.
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Now, checking the engine itself, check your UE installation from the Launcher, and apply “Verify” from the dropdown menu, to ensure your install is not missing any elements.
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Finally, checking the project itself, perform a clear cache, via deleting Intermediate and Binaries folders from your main directory. After that, restart UE, and allow it to rebuild the files.