Warning: Invalid argument supplied

Hi,

My website is https://www.tenerife-belfin-property.com
I’m using the twentytwelve theme.

Tonight I realised that I couldn’t add tags in the real estate plugin that I’m using.

So I disabled all plugins to see if one of them caused the problem (which didn’t help).
After activating all the plugins again, I now get an error message on one of my pages: “Warning: Invalid argument supplied for foreach() in /customers/d/f/2/tenerife-belfin-property.com/httpd.www/wp-content/plugins/wprealestate/functions.php on line 287 “

The page: https://www.tenerife-belfin-property.com/search

I tried to disable one for one the active plugins but nothing helps.
The error messages stays on the page.

Can anyone help me and point me in the right direction?
Any help would be appreciated. Thank you very much!