Nesting too deep?

[AlexC]

Hi, I deleted my links and readded them, since I'm picky about order and stuff... then suddenly in the middle of adding them, I got this message;

Fatal error: Nesting level too deep - recursive dependency? in /home/ratties/public_html/rats/classes/resource/collection/linkedhashmap.php on line 192

Line 192 in the file is; for($entry = $this->header->getAfter(); $entry != $this->header; $entry = $entry->getAfter()){

I thought maybe I'd accidentally made a link a child of another child link? But it seems to be fine. The ID of the link is 43. I can still access the rest of the ACP, just not the admincp/links/add page

EDIT: It is not letting me edit links - but I was able to delete one, and readd it and then it gave me the error again.