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Fix crash when error()ing an invalid value on programming (#418)
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@ -718,7 +718,7 @@ local function on_receive_fields(pos, form_name, fields, sender)
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local ok, err = set_program(pos, fields.code)
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if not ok then
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-- it's not an error from the server perspective
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minetest.log("action", "Lua controller programming error: " .. err)
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minetest.log("action", "Lua controller programming error: " .. tostring(err))
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end
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end
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