[imp] Search results of more than 100 messages cause 'error communicating with the server'

[Tim ODriscoll]

Quoting Michael M Slusarz <slusarz at horde.org>:
> What is the error message/backtrace in your Horde log?

I turned on debug logging and tried my search. This is the error in  
the Horde log, including a few lines from above the actual error and  
below because I can't quite tell which bits are useful...

Many thanks,

Tim

2014-08-19T21:10:19+01:00 DEBUG: HORDE Load config file (nls.php; app:  
horde) [pid 31786 on line 109 of  
"/usr/share/php/Horde/Registry/Loadconfig.php"]
2014-08-19T21:10:19+01:00 DEBUG: HORDE [horde] Max memory usage:  
1048576 bytes [pid 31786 on line 618 of  
"/usr/share/php/Horde/Registry.php"]
2014-08-19T21:10:20+01:00 DEBUG: HORDE Load config file (conf.php;  
app: horde) [pid 30356 on line 109 of  
"/usr/share/php/Horde/Registry/Loadconfig.php"]
2014-08-19T21:10:20+01:00 DEBUG: HORDE Read session data (id =  
b360ou1918d7c7add1rq73co52) [pid 30356]
2014-08-19T21:10:20+01:00 DEBUG: HORDE [imp] Load config file  
(conf.php; app: imp) [pid 30356 on line 109 of  
"/usr/share/php/Horde/Registry/Loadconfig.php"]
2014-08-19T21:10:20+01:00 DEBUG: HORDE [imp] Load config file  
(hooks.php; app: imp) [pid 30356 on line 109 of  
"/usr/share/php/Horde/Registry/Loadconfig.php"]
2014-08-19T21:10:20+01:00 EMERG: HORDE [imp] Call to a member function  
fetch() on a non-object [pid 30356 on line 1616 of  
"/usr/share/horde/imp/lib/Contents.php"]
2014-08-19T21:10:20+01:00 DEBUG: HORDE 1.  
Horde_ErrorHandler::catchFatalError()

2014-08-19T21:10:25+01:00 DEBUG: HORDE Load config file (conf.php;  
app: horde) [pid 23343 on line 109 of  
"/usr/share/php/Horde/Registry/Loadconfig.php"]
2014-08-19T21:10:25+01:00 DEBUG: HORDE Read session data (id =  
obetc4sus9v32gfukdp6u8jfa7) [pid 23343]
2014-08-19T21:10:25+01:00 DEBUG: HORDE [imp] Load config file  
(conf.php; app: imp) [pid 23343 on line 109 of  
"/usr/share/php/Horde/Registry/Loadconfig.php"]
2014-08-19T21:10:25+01:00 DEBUG: HORDE [imp] Load config file  
(hooks.php; app: imp) [pid 23343 on line 109 of  
"/usr/share/php/Horde/Registry/Loadconfig.php"]