I am usingweblinks 3.4.1 and Joomla 3.4.8 (both latest).
Today I saw this error twice on my error_log:
PHP Fatal error: Call to a member function getChildren() on a non-object in /components/com_weblinks/router.php on line 210
I have no idea how it came up. This error never appeared again in the log in the last 3 days. I have randomly clicked all the weblinks menus (Which were present there for more than 3 years) and items and could not manage to reproduce the error.
Hmm, did you delete a weblink category? (And empty the trash)
Thanks for the report @hakanara
Could you provide steps to reproduce it?