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Books: Add nil value checks to the book formspec handler
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@ -80,7 +80,8 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
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local inv = player:get_inventory()
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local stack = player:get_wielded_item()
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if fields.save and fields.title ~= "" and fields.text ~= "" then
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if fields.save and fields.title and fields.text
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and fields.title ~= "" and fields.text ~= "" then
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local new_stack, data
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if stack:get_name() ~= "default:book_written" then
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local count = stack:get_count()
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