Method clear_assign works incorectly ir single key is passed. It searches for value instead of key and tries to unset some non-setted $index key (artifact of copy-paste programming, IMHO).
Added patch to fix this small bug.
Bug fix
Anonymous
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Thank you for the contribution. This is now incuded in the dev code. It will be released in 2.2 in January 2018.
Bug fix
Thank you for the contribution. This is now incuded in the dev code. It will be released in 2.2 in January 2018.