Launcher got stuck in loading screen while migrating profiles.
[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)
The Launcher is not crashing, it stays in loading screen until I close the window.
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thanks a lot, to know were the problem is, helped me to "fix" it.
I just deleted the profiles and created new ones.

Please do not set tickets to private since there are not sensitive information like adresses or passwords in the log files.

Is this still a concern in the current Minecraft Launcher version 2.0.1003 / 2.0.1004? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. It will be reopened it as soon as the requested information has been delivered.
May be (one of) the cause of MCL-5293