Earlier today we released build 188.8.131.52 to the Canary channel. Unfortunately, this build contained a bug which caused some macOS users to crash on launch. We have now fixed this bug and released 184.108.40.206 to the Canary channel. Your device will be automatically updated in the coming hours, but if you'd like to get the fix immediately the easiest way to do it is to download and install the PKG file from https://www.microsoftedgeinsider.com/download. Just click on "Download" for the Canary channel and install just as you did the first time. Your settings and browsing data will be preserved.
Please let us know if you have any other issues or questions, and once again thanks for being an insider.