diff --git a/calendar/inc/class.calendar_ical.inc.php b/calendar/inc/class.calendar_ical.inc.php
index c685178f00..b9d436999d 100644
--- a/calendar/inc/class.calendar_ical.inc.php
+++ b/calendar/inc/class.calendar_ical.inc.php
@@ -2223,7 +2223,7 @@ class calendar_ical extends calendar_boupdate
 		}
 
 		if (!is_a($component, 'Horde_Icalendar_Vevent') ||
-			!($event = $this->vevent2egw($component, $container ? $container->getAttribute('VERSION') : '2.0',
+			!($event = $this->vevent2egw($component, $container ? $container->getAttributeDefault('VERSION', '2.0') : '2.0',
 				$this->supportedFields, $principalURL, $container)))
 		{
 			return false;
@@ -2283,8 +2283,8 @@ class calendar_ical extends calendar_boupdate
 		}
 
 		/*
-		$mozillaACK = $component->getAttribute('X-MOZ-LASTACK');
-		if ($this->productName == 'lightning' && !is_a($mozillaACK, 'PEAR_Error'))
+		$mozillaACK = $component->getAttributeDefault('X-MOZ-LASTACK', null);
+		if ($this->productName == 'lightning' && !isset($mozillaACK))
 		{
 			if ($this->log)
 			{
@@ -2861,9 +2861,11 @@ class calendar_ical extends calendar_boupdate
 								$vcardData['participants'][$uid] =
 									calendar_so::combine_status($status, $quantity, $role);
 
-								if (!$this->calendarOwner && is_numeric($uid) &&
-										$role == 'CHAIR' &&
-										is_a($component->getAttribute('ORGANIZER'), 'PEAR_Error'))
+								try {
+									if (!$this->calendarOwner && is_numeric($uid) && $role == 'CHAIR')
+										$component->getAttribute('ORGANIZER');
+								}
+								catch(Horde_Icalendar_Exception $e)
 								{
 									// we can store the ORGANIZER as event owner
 									$event['owner'] = $uid;
@@ -2910,9 +2912,8 @@ class calendar_ical extends calendar_boupdate
 		}
 		// check if the entry is a birthday
 		// this field is only set from NOKIA clients
-		$agendaEntryType = $component->getAttribute('X-EPOCAGENDAENTRYTYPE');
-		if (!is_a($agendaEntryType, 'PEAR_Error'))
-		{
+		try {
+			$agendaEntryType = $component->getAttribute('X-EPOCAGENDAENTRYTYPE');
 			if (strtolower($agendaEntryType) == 'anniversary')
 			{
 				$event['special'] = '1';
@@ -2925,6 +2926,7 @@ class calendar_ical extends calendar_boupdate
 				$event['special'] = '2';
 			}
 		}
+		catch (Horde_Icalendar_Exception $e) {}
 
 		$event['priority'] = 2; // default
 		$event['alarm'] = $alarms;
@@ -3005,13 +3007,15 @@ class calendar_ical extends calendar_boupdate
 		}
 
 		// Apple iCal on OS X uses X-CALENDARSERVER-ACCESS: CONFIDENTIAL on VCALANDAR (not VEVENT!)
-		if ($this->productManufacturer == 'GroupDAV' && $container &&
-			($x_calendarserver_access = $container->getAttribute('X-CALENDARSERVER-ACCESS')) &&
-			!is_a($x_calendarserver_access, 'PEAR_Error'))
-		{
-			$event['public'] =  (int)(strtoupper($x_calendarserver_access) == 'PUBLIC');
+		try {
+			if ($this->productManufacturer == 'GroupDAV' && $container &&
+				($x_calendarserver_access = $container->getAttribute('X-CALENDARSERVER-ACCESS')))
+			{
+				$event['public'] =  (int)(strtoupper($x_calendarserver_access) == 'PUBLIC');
+			}
+			//error_log(__METHOD__."() X-CALENDARSERVER-ACCESS=".array2string($x_calendarserver_access).' --> public='.array2string($event['public']));
 		}
-		//error_log(__METHOD__."() X-CALENDARSERVER-ACCESS=".array2string($x_calendarserver_access).' --> public='.array2string($event['public']));
+		catch (Horde_Icalendar_Exception $e) {}
 
 		// if no end is given in iCal we use the default lenght from user prefs
 		// whole day events get one day in calendar_boupdate::save()
@@ -3023,8 +3027,7 @@ class calendar_ical extends calendar_boupdate
 		if ($this->calendarOwner) $event['owner'] = $this->calendarOwner;
 
 		// parsing ATTACH attributes for managed attachments
-		$attr = $component->getAttribute('X-EGROUPWARE-ATTACH-INCLUDED');
-		$event['attach-delete-by-put'] = !is_a($attr, PEAR_Error) && $attr === 'TRUE';
+		$event['attach-delete-by-put'] = $component->getAttributeDefault('X-EGROUPWARE-ATTACH-INCLUDED', null) === 'TRUE';
 		$event['attach'] = $component->getAllAttributes('ATTACH');
 
 		if ($this->log)
diff --git a/infolog/inc/class.infolog_ical.inc.php b/infolog/inc/class.infolog_ical.inc.php
index aaeb592c9c..7f38456404 100644
--- a/infolog/inc/class.infolog_ical.inc.php
+++ b/infolog/inc/class.infolog_ical.inc.php
@@ -685,15 +685,19 @@ class infolog_ical extends infolog_bo
 			// iOS reminder app only sets COMPLETED, but never STATUS nor PERCENT-COMPLETED
 			// if we have no STATUS, set STATUS by existence of COMPLETED and/or PERCENT-COMPLETE and X-INFOLOG-STATUS
 			// if we have no PERCENT-COMPLETE set it from STATUS: 0=NEEDS-ACTION, 10=IN-PROCESS, 100=COMPLETED
-			if (!($status = $component->getAttribute('STATUS')) || !is_scalar($status))
+			try {
+				$status = $component->getAttribute('STATUS');
+			}
+			catch (Horde_Icalendar_Exception $e)
 			{
-				$completed = $component->getAttribute('COMPLETED');
-				$x_infolog_status = $component->getAttribute('X-INFOLOG-STATUS');
+				unset($e);
+				$completed = $component->getAttributeDefault('COMPLETED', null);
+				$x_infolog_status = $component->getAttributeDefault('X-INFOLOG-STATUS', null);
 				// check if we have a X-INFOLOG-STATUS and it's completed state is different from given COMPLETED attr
 				if (is_scalar($x_infolog_status) &&
 					($this->_status2vtodo[$x_infolog_status] === 'COMPLETED') != is_scalar($completed))
 				{
-					$percent_completed = $component->getAttribute('PERCENT-COMPLETE');
+					$percent_completed = $component->getAttributeDefault('PERCENT-COMPLETE', null);
 					$status = $completed && is_scalar($completed) ? 'COMPLETED' :
 						($percent_completed && is_scalar($percent_completed) && $percent_completed > 0 ? 'IN-PROCESS' : 'NEEDS-ACTION');
 					$component->setAttribute('STATUS', $status);
@@ -756,7 +760,7 @@ class infolog_ical extends infolog_bo
 					case 'DURATION':
 						if (!isset($taskData['info_startdate']))
 						{
-							$taskData['info_startdate']	= $component->getAttribute('DTSTART');
+							$taskData['info_startdate']	= $component->getAttributeDefault('DTSTART', null);
 						}
 						$attribute['value'] += $taskData['info_startdate'];
 						$taskData['##DURATION'] = $attribute['value'];
@@ -800,7 +804,7 @@ class infolog_ical extends infolog_bo
 					case 'STATUS':
 						// check if we (still) have X-INFOLOG-STATUS set AND it would give an unchanged status (no change by the user)
 						$taskData['info_status'] = $this->vtodo2status($attribute['value'],
-							($attr=$component->getAttribute('X-INFOLOG-STATUS')) && is_scalar($attr) ? $attr : null);
+							$component->getAttributeDefault('X-INFOLOG-STATUS', null));
 						break;
 
 					case 'SUMMARY':