Strange error when attemprint to save a file

[fessmK]

Edit:this I figured it out.

So, I have a simple function that serilizes a string and saves it to a file, and I am getting a C++ runtime error when the code attempts to run

code:
where the function is called

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minetest.register_on_shutdown(function()
	main.debug("shutting down") --this line runs
	main.save_data_namechange("Savedata", {"string1", "string2"})
end)

the function definition: (developed from datastorage)

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function main.save_data_namechange(name, data)
	main.debug("I sure hope this prints") --this line is not run.
	if not name then return end
	if not data then return end
	data_string = minetest.serialize(data)
	
	if not data_string then return end
	
	local file = io.open(main.data_path..name..main.data_ext "w")
	if not file then
		-- Most likely the data directory doesn't exist, create it
		-- and try again.
		if minetest.mkdir then
			main.debug("the mkdir function is being run")
			minetest.mkdir(main.data_path..name..main.data_ext)
		else
			-- Using os.execute like this is not very platform
			-- independent or safe, but most platforms name their
			-- directory creation utility mkdir, the data path is
			-- unlikely to contain special characters, and the
			-- data path is only mutable by the admin.
			main.debug("the os function is being run")
			os.execute('mkdir "'..main.data_path..name..main.data_ext..'"')
		end
		file = io.open(main.data_path..name..main.data_ext..id, "w")
		if not file then return end--just fail if it can't create directory
	end

	file:write(data_string)
	file:close()
	return true
end

that debug function:

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function main.debug(text)
	minetest.debug(main.debug_message .. text)
	minetest.chat_send_all(main.debug_message .. text)
end

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main.debug_message = "MAIN: "

the error:

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Microsoft Visual C++ Rumtime Library

Runtime Error!

Program D:\Minetest\minetest-0.4.15-win64\bin\minetest.exe

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

If anyone knows what is going on here, please let me know. It seams that the engine crashes the moment the function is called, before any of its content code to be run. However, other functions run in minetest.register_on_shutdown just fine.

Edit: for anyone with the same question, it crash resulted from passing a table as a parameter during shutdown. I fixed the error by having a static directory that all the data I want saved being placed into, then having the function just save that.