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None of out programmers has changed anything to the code, but out of nothing now, when a user tries to login on the backend, we have this error:

Fatal error: Call to a member function children() on a non-object in /home/r1tech/public_html/app/code/core/Mage/Admin/Model/User.php on line 437

Any ideas why this is happening?

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When does that error appear? – JMC Dec 20 '11 at 21:13
Sorry, forgot to mention that... it is when the user tries to login on the backend. – Beto Frega Dec 27 '11 at 18:42
up vote 0 down vote accepted

Not a real Magento problem.

Somehow the files got corrupted. I re-uploaded everything and now it works just fine.

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