Read the statement by Michael Teeuw here.
After update 2.23.0 crash
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 @JerryP Always use Sam’s update script. I used it last night and updated from 2.21.0 to 2.23.0 no issues. Often modules with a package.json requires an npm install in that folder and the upgrade script takes care of all of that. 
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 @Wenike do this from a terminal window ps -ef | grep nodethis will show you the node processes running and parms to what they are running (file path) if all looks understandable and u can’t terminate them thru app shutdown (pm2 stop all will stop all.managed apps, mm included), do ps -ef | grep node | awk '{ print $2 }' | xargs kill -9this will hard kill all the node processes 
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 the script does a new npm install in modules that have a package.json but I know the post install process is wrong for this module my fork fixes that 
 https://github.com/sdetweil/MMM-PIR-Sensor
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 @sdetweil Perfect, fixed it. Thanks! 
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 @JerryP said in After update 2.23.0 crash: sudo git pull just one more thing NEVER use sudo with MM no need for it. 
 all it does is lead to trouble
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 @sdetweil Thank you very much. Had the same error (cannot find module envsub) on updating the MagicMirror to the new version and this step (rm -rf node_modules and then npm install again) solved the issue for me. 
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 @hrjmsh you should use my upgrade script 
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 @sdetweil I did, both with and without changes applied. Unfortunately, it didn’t work for me. The only thing that worked was the solution you provided by removing the node_modules and then reinstalling npm. 
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 @hrjmsh can u send me the MagicMirror/installers/upgrade.log same userid at gmail never seen this problem 
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 @hrjmsh Thank you so much!!! (rm -rf node_modules and then npm install again) worked like a charm! 

