[0212/133640:INFO:LauncherAppBrowser.cpp(24)] Work dir is C:\Users\Jan\AppData\Roaming\.minecraft

[0212/133640:INFO:ClientHandler.cpp(182)] Creating launcher window.

[0212/133643:INFO:LauncherAppRenderer.cpp(110)] Javascript bridge extended.

[0212/133651:INFO:ClientHandler.cpp(846)] Preferences / startup: Read preferences

[0212/133651:INFO:ClientHandler.cpp(846)] TypeError: Cannot read property 'indexOf' of null
    at Object.o.migrateFromProfilesFormat1 (mojang://launcher/assets/js/launcher.js:2:19180)
    at Object.o.checkMigrate (mojang://launcher/assets/js/launcher.js:2:20768)
    at Object.<anonymous> (mojang://launcher/assets/js/launcher.js:2:20801)
    at Object.a [as invoke] (mojang://launcher/assets/js/vendor.js:6:20801)
    at Object.$get (mojang://launcher/assets/js/vendor.js:6:18983)
    at Object.a [as invoke] (mojang://launcher/assets/js/vendor.js:6:20801)
    at mojang://launcher/assets/js/vendor.js:6:21374
    at r (mojang://launcher/assets/js/vendor.js:6:20223)
    at i (mojang://launcher/assets/js/vendor.js:6:20523)
    at Object.a [as invoke] (mojang://launcher/assets/js/vendor.js:6:20695)