If one searches for something which returns an emtpy list, the following popup is shown:
"Spotlight error list index out of range"
To me this seems like a global try-catch catching an index-out-of-bounds-exception. It should be handled properly earlier in the code, and the message should be something like "No matches found" or similar.
I'm using v1.2.0 and XBMC 13.1 (OpenELEC v4.0.5).