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"PANIC: unprotected error in call to Lua API (bad argument #-1 (table expected, got number))"

reproduce:
create a minetest entity with "upright sprite", the two png's, and then put colors = {0,0}, then run it

should say colors = { {255,255,255,255},{255,255,255,255} } --alpha,red,green,blue for each side

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