I got this error while pasting one of my raidable bases. Not sure what item this refers to that cause the paste to crash, but I found a fix by making a ContainsKey check in PasteEntity:
Replace this line:
pasteData.EntityLookup.Add(oldId, ioData);With this line:
if (!pasteData.EntityLookup.ContainsKey(oldId))
{
pasteData.EntityLookup.Add(oldId, ioData);
}Hope this helps!