FOSS gamedev and creative worlds

My server crashes with error "/home/user/minetest/src/inventory.cpp:629: ItemStack& InventoryList::getItem(irr::u32) Assertion 'i < m_size' failed.".
I am know that this is bug in mod code(i have solved very similar bug in the past, spent much time to find which mod was causing that and on which line).
Problem is, that engine is not showing me in which .lua file and on which line mistake is.

It's not a Lua error, it's in inventory.cpp.

Issue on Github: https://github.com/minetest/minetest/issues/2028