We'll check, thanks.

@amoun Hi, I tested what you wrote, even with same url format with dates in url and &disp=single, but could not reproduce.

I see your url has the param &disp=single, I don't know why you have this in urls but it doesn't matter, so as I understand you try to open permanent url of "Post" when it was already updated to "Standalone Page" and you see an expected message like "nothing to display..." and the warning above.

I checked the code in the _results.class.php on the line 2500 and there is no wrong code.
The warning may appears only if your own skin has a wrong code, I think you should go to your skin files and find function display_if_empty(), this function may has a single param and it must be an array, i.e. your code must be like display_if_empty( array( 'msg_empty' => '...' ) ). Please check especially files _single.disp.php and single.main.php, if you don't have them then check index.main.php for the same function display_if_empty(). It seems your skin uses a not array param there.

Thanks.

@yurabakhtin will check my skin out as you suggested. Thanks

@yurabakhtin
So far I've found display_if_empty();
in as you suggested, my ancient skin from 2008, an old modified simple-zen

in 6.10.8 as examples
/skins
. . . evopress/single.main.php
. . . basic/index.main.php
. . . bootstrap_manual/_single.disp.php
. . . dating_mood/index.main.php
/skins/fallback_v6/_single.disp.php

in fact I haven't found an instance where there is any with array content.

I was thinking it was the array issue so I will try and replicate and then change the code by adding a constant and message.

@amoun Did you fix the warning in your skin?

Sorry no! Busy building a cabin. Will look sometime hopefully so thanks for the reminder