Solved Locked Topics gets a "500 Internal Server Error"

I just upgraded to 4.0, and one of my Categories got a "500 Internal Server Error" if there are Locked topic inside, in Blue Eagle Template only. The problem occures when you try to display the Category page.

I fixed the problem by applying Crypsis template, and removing the locked topics. Then I went back to the Blue Eagle Template, and it worked fine.

Crypsis template sounds promising but It needs some improvements IMO.
So I prefer using Blue Eagle Template for now.

if you enable kunena debug, on the config.

What is the error message?

I enabled one the locked toopic, and I got this :

The error was detected in the Libraries.

Fatal Error: Call to a member function getEbayItemFromCache() on a non-object in libraries/kunena/bbcode/bbcode.php on line 192

ok, try to clean cache.

OK.
I've found the topic which was the problem. It does not come from the Lock fonction, it's caused by the Ebay function. Someone used it in this topic. When I try to display the topic, I've got the 500 Error page.

This time the errors occures when I display the topic, on both templates.

Maybe it's because the Ebay item is not available anymore ? Or maybe it's a bug when you use the ebay function.

I cleaned Joomla cache, and it's still the same.

do you entered the right ebay keys?