Experiencing same issue
I'm also seeing errors related to this in Plesk:
OS Linux 2.6.18-308.4.1.el5PAE
Panel version 10.4.4 Update #45, last updated at Oct 12, 2012 04:03 AM
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PHP Catchable Fatal Error: Argument 1 passed to Health_Parameter_Abstract::setValue() must be an array, null given
Line: 203
File: /usr/local/psa/admin/plib/Health/Parameter/Abstract.php
Stack Trace:
#0 Smb_Exception_Syntax::handleError(4096, Argument 1 passed to Health_Parameter_Abstract::setValue() must be an array, null given, /usr/local/psa/admin/plib/Health/Parameter/Abstract.php, 203, Array ()) called at [/usr/local/psa/admin/plib/Health/Parameter/Abstract.php:203]
#1 Health_Parameter_Abstract->setValue()
#2 call_user_func_array(Array ([0] => Health_Parameter_Ram_TotalUsage Object ([] => Health_Parameter_Id Object ([] => TotalUsage,[] => Health_Parameter_Id Object ([] => Ram,[] => )),[] => TotalUsage,[] => memory/memory-used.rrd,[] => Health_Data Object ([] => Health_Data_Adapter_RRDTool_Exec Object ()),[] => ,[] => Health_Parameter_Trend Object ([] => 1099150322.35,[] => 1089350967.7583,[] => 0,[] => asSign,[] => relativeIncrease,[] => 2),[] => 8500109312,[] => Health_Data_TimeInterval Object ([] => now-1minute,[] => ),[] => Health_Data_TimeInterval Object ([] => now-2h,[] => ),[] => Health_Data_TimeInterval Object ([] => now-1h,[] => ),[] => Health_Alarm_Counter Object ([] => Health_Parameter_Ram_TotalUsage Object ( *RECURSION*,[] => ,[] => Zend_Config Object ([] => ,[] => 0,[] => 2,....(removed more data from this array to fit the post limit)
#3 Health_Data_Collector->_updateParameter(Health_Parameter_Ram_TotalUsage Object ([] => Health_Parameter_Id Object ([] => TotalUsage,[] => Health_Parameter_Id Object ([] => Ram,[] => )),[] => TotalUsage,[] => memory/memory-used.rrd,[] => Health_Data Object ([] => Health_Data_Adapter_RRDTool_Exec Object ()),[] => ,[] => Health_Parameter_Trend Object ([] => 1099150322.35,[] => 1089350967.7583,[] => 0,[] => asSign,[] => relativeIncrease,[] => 2),[] => 8500109312,....(removed more data from this array to fit the post limit)
#4 Health_Data_Collector->_update(Array ([now-5minute] => Array ([0] => Array ([id] => Services->CpuTime->Web,[values] => Array ([0] => Array ([db] => processes-Web/ps_cputime.rrd,[ds] => user),[1] => Array ([db] => processes-Web/ps_cputime.rrd,[ds] => syst)),[setFunc] => setValue,[setFuncParamIndex] => 0),[1] => Array ([id] => Services->CpuTime->Mail,[values] => Array ([0] => Array ([db] => processes-Mail/ps_cputime.rrd,[ds] => user),[1] => Array ([db] => processes-Mail/ps_cputime.rrd,[ds] => syst)),[setFunc] => setValue,[setFuncParamIndex] => 0),[2] => Array ([id] => Services->CpuTime->MySql,[values] => Array ([0] => Array ([db] => processes-MySql/ps_cputime.rrd,[ds] => user),[1] => Array ([db] => processes-MySql/ps_cputime.rrd,[ds] => syst)),[setFunc] => setValue,[setFuncParamIndex] => 0),....(removed more data from this array to fit the post limit)
#5 Health_Data_Collector->updateSummary() called at [/usr/local/psa/admin/panel/application/views/scripts/health/parameters.phtml:144]
#6 include(/usr/local/psa/admin/panel/application/views/scripts/health/parameters.phtml) called at [/usr/local/psa/admin/plib/Zend/View.php:108]
#7 Zend_View->_run(/usr/local/psa/admin/panel/application/views/scripts/health/parameters.phtml) called at [/usr/local/psa/admin/plib/Zend/View/Abstract.php:888]
#8 Zend_View_Abstract->render(health/parameters.phtml) called at [/usr/local/psa/admin/plib/Zend/Controller/Action/Helper/ViewRenderer.php:908]
#9 Zend_Controller_Action_Helper_ViewRenderer->renderScript(health/parameters.phtml, ) called at [/usr/local/psa/admin/plib/Zend/Controller/Action/Helper/ViewRenderer.php:929]
#10 Zend_Controller_Action_Helper_ViewRenderer->render() called at [/usr/local/psa/admin/plib/Zend/Controller/Action/Helper/ViewRenderer.php:968]
#11 Zend_Controller_Action_Helper_ViewRenderer->postDispatch() called at [/usr/local/psa/admin/plib/Zend/Controller/Action/HelperBroker.php:277]
#12 Zend_Controller_Action_HelperBroker->notifyPostDispatch() called at [/usr/local/psa/admin/plib/Zend/Controller/Action.php:523]
#13 Zend_Controller_Action->dispatch(parametersAction) called at [/usr/local/psa/admin/plib/Zend/Controller/Dispatcher/Standard.php:295]
#14 Zend_Controller_Dispatcher_Standard->dispatch(Zend_Controller_Request_Http Object ([] => Array ([0] => _GET,[1] => _POST),[] => /admin/health/parameters,[] => /admin,[] => ,[] => /health/parameters,[] => Array ([controller] => health,[action] => parameters,[module] => default),[] => ,[] => Array (),[] => 1,[] => default,[] => module,[] => health,[] => controller,[] => parameters,[] => action), Zend_Controller_Response_Http Object ([] => Array (),[] => Array (),[] => Array (),[] => Array (),[] => 200,[] => ,[] => ,[headersSentThrowsException] => 1)) called at [/usr/local/psa/admin/plib/Zend/Controller/Front.php:954]
#15 Zend_Controller_Front->dispatch() called at [/usr/local/psa/admin/panel/application/library/AdminPanel/Application/Web.php:20]
#16 AdminPanel_Application_Web->run() called at [/usr/local/psa/admin/panel/application/public/index.php:15]