Many (!) frontend_latest t.trim is not a function errors ..?

all of a sudden my logs are filled with this:

frontend_latest/app-84dbe97abaff729106f432c1f49ac9a0.js:2:12082 TypeError: t.trim is not a function. (In 't.trim()', 't.trim' is undefined

NO idea what this means (yet) or where this originates…
anyone with a hint?