Same here - web clipper version 7.12.3.4-780394b
In my case - Chrome Beta Version 80.0.3987.42 (Official Build) beta (64-bit)
In the web clipper logs:
2020\1\14 10:49:12 LOG Account logged out: r:{"errorCode":5,"parameter":"authenticationToken"}
2020\1\14 10:49:13 WRN Could not login while handling browser action. Error: Cannot read property 'isBusiness' of null TypeError: Cannot read property 'isBusiness' of null at Object.generateUserCD (chrome-extension://pioclpoplcdbaefihamjohnefbikjilc/commons.js:26:105011) at chrome-extension://pioclpoplcdbaefihamjohnefbikjilc/commons.js:26:118562
Going to revert to a previous version of the clipper and see if it helps...