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Full backtrace here:
I believe this also happens due to removed texture entries in the maps config. So might not be related to only vlayer, others such as vcolour etc might produce the same crash once a vslot is created whilst the texture config used by that slot has later been removed.
There doesn't seem to be a way to manually remove a vslot from a map file, but as a work around to stop the saved map crashing you can duplicate a texture in the map config several times so that it reoccupies the missing vslot.