Hi, Chestile. Like you, I’m having the same problem; for me it started with the version 5 when Color Efex Pro was updated to the new interface since Color Efex is the Nik app I use the most.
There are several threads on here about this issue; see for example NIK 5 crashing Lightroom. After trying a couple of workarounds, I’ve settled on using “Edit in Adobe Photoshop 2022” from Lightroom, using the Nik Collection plugins in Photoshop instead, then saving the TIFF file in Photoshop (which adds it back to the Lightroom catalog). It took me a little while to get used to this method and the extra steps involved, but now that I’m accustomed to it I like it pretty well. If you take a look at the thread I mentioned above, you’ll also see a couple of links to DxO documentation that describe how to use the plugins in Photoshop more efficiently.
Regards,
Dale