diff --git a/application/views/system/infocenter/infocenterData.php b/application/views/system/infocenter/infocenterData.php
index 6a6600d4d..a4776e14d 100644
--- a/application/views/system/infocenter/infocenterData.php
+++ b/application/views/system/infocenter/infocenterData.php
@@ -2,25 +2,70 @@
 
 	$filterWidgetArray = array(
 		'query' => '
+		SELECT *
+		FROM (
 			SELECT p.person_id AS "PersonId",
 					p.vorname AS "Vorname",
 					p.nachname AS "Nachname",
 					p.gebdatum AS "Gebdatum",
-					l.zeitpunkt AS "LastAction",
-					l.insertvon AS "User/Operator"
-			  FROM public.tbl_person p INNER JOIN system.tbl_log l USING(person_id)
+					(SELECT zeitpunkt
+					   FROM system.tbl_log
+					  WHERE app = \'aufnahme\'
+					    AND person_id = p.person_id
+				   ORDER BY zeitpunkt DESC
+				      LIMIT 1) AS "LastAction",
+					(SELECT insertvon
+					   FROM system.tbl_log
+					  WHERE app = \'aufnahme\'
+					    AND person_id = p.person_id
+				   ORDER BY zeitpunkt DESC
+				      LIMIT 1) AS "User/Operator",
+					(SELECT pss.studiensemester_kurzbz
+					   FROM public.tbl_prestudentstatus pss
+			     INNER JOIN public.tbl_prestudent ps USING(prestudent_id)
+					  WHERE pss.status_kurzbz = \'Interessent\'
+					    AND pss.bestaetigtam IS NULL
+					    AND pss.bestaetigtvon IS NULL
+					    AND ps.person_id = p.person_id
+				   ORDER BY pss.datum DESC, pss.insertamum DESC, pss.ext_id DESC
+			  		  LIMIT 1) AS "Studiensemester",
+	  				(SELECT pss.bewerbung_abgeschicktamum
+	  				   FROM public.tbl_prestudentstatus pss
+	  		     INNER JOIN public.tbl_prestudent ps USING(prestudent_id)
+	  				  WHERE pss.status_kurzbz = \'Interessent\'
+	  				    AND pss.bestaetigtam IS NULL
+	  				    AND pss.bestaetigtvon IS NULL
+	  				    AND ps.person_id = p.person_id
+	  			   ORDER BY pss.datum DESC, pss.insertamum DESC, pss.ext_id DESC
+	  		  		  LIMIT 1) AS "SendDate"
+			  FROM public.tbl_person p
 			 WHERE p.aktiv = TRUE
-			   AND l.app = \'aufnahme\'
+			   AND p.person_id IN (
+				   SELECT person_id
+				     FROM public.tbl_prestudent
+			   INNER JOIN public.tbl_prestudentstatus USING(prestudent_id)
+			        WHERE status_kurzbz = \'Interessent\'
+					  AND bestaetigtam IS NULL
+					  AND bestaetigtvon IS NULL)
+		  GROUP BY 1, 2, 4, 5, 6, 7
+		  ORDER BY "LastAction" DESC
+	  ) tbl_infocenter
+		WHERE "Studiensemester" IN (
+			SELECT studiensemester_kurzbz
+			  FROM public.tbl_studiensemester
+			 WHERE (NOW() >= start AND NOW() <= ende)
+			 	OR start > NOW()
+		)
 		',
 		'hideHeader' => false,
 		'hideSave' => false,
 		'additionalColumns' => array('Details'),
 		'formatRaw' => function($fieldName, $fieldValue, $datasetRaw) {
 
-			$link = '<a href="%s%s" target="_blank">Details</a>';
-
 			if ($fieldName == 'Details')
 			{
+				$link = '<a href="%s%s" target="_blank">Details</a>';
+
 				$datasetRaw->{$fieldName} = sprintf(
 					$link,
 					base_url('index.ci.php/system/infocenter/infocenterDetails/showDetails/'),
@@ -28,6 +73,30 @@
 				);
 			}
 
+			if ($fieldName == 'SendDate')
+			{
+				if ($datasetRaw->{$fieldName} == '1970.01.01 01:00:00')
+				{
+					$datasetRaw->{$fieldName} = 'Not sent';
+				}
+			}
+
+			if ($fieldName == 'LastAction')
+			{
+				if ($datasetRaw->{$fieldName} == '1970.01.01 01:00:00')
+				{
+					$datasetRaw->{$fieldName} = 'Not logged';
+				}
+			}
+
+			if ($fieldName == 'User/Operator')
+			{
+				if ($datasetRaw->{$fieldName} == '')
+				{
+					$datasetRaw->{$fieldName} = 'NA';
+				}
+			}
+
 			return $datasetRaw;
 		}
 	);
diff --git a/application/widgets/FilterWidget.php b/application/widgets/FilterWidget.php
index 59a4ae334..438862eb1 100644
--- a/application/widgets/FilterWidget.php
+++ b/application/widgets/FilterWidget.php
@@ -51,6 +51,8 @@ class FilterWidget extends Widget
 	const OP_IS_FALSE = 'false';
 	const OP_CONTAINS = 'contains';
 	const OP_NOT_CONTAINS = 'ncontains';
+	const OP_SET = 'set';
+	const OP_NOT_SET = 'nset';
 
 	const OPT_DAYS = 'days';
 	const OPT_MONTHS = 'months';
@@ -95,9 +97,17 @@ class FilterWidget extends Widget
 	 */
 	public function display($widgetData)
 	{
+		//
 		$filterSessionArray = $this->session->userdata(self::SESSION_NAME);
-		if ((isset($filterSessionArray[self::SELECTED_FIELDS]) && count($filterSessionArray[self::SELECTED_FIELDS]) == 0)
-			&& (isset($filterSessionArray[self::SELECTED_FILTERS]) && count($filterSessionArray[self::SELECTED_FILTERS]) == 0))
+
+		//
+		if ($this->filterId == null && isset($filterSessionArray[self::FILTER_ID]))
+		{
+			$this->filterId = $filterSessionArray[self::FILTER_ID];
+		}
+
+		//
+		if ($filterSessionArray[self::FILTER_ID] != $this->filterId)
 		{
 			//
 			$this->_loadFilter();
@@ -281,6 +291,8 @@ class FilterWidget extends Widget
 				<span>
 					<select name="%s" class="select-filter-operation">
 						<option value="'.self::OP_LESS_THAN.'" '.($activeFilterOperationValue == self::OP_LESS_THAN ? 'selected' : '').'>less than</option>
+						<option value="'.self::OP_SET.'" '.($activeFilterOperationValue == self::OP_SET ? 'selected' : '').'>is set</option>
+						<option value="'.self::OP_NOT_SET.'" '.($activeFilterOperationValue == self::OP_NOT_SET ? 'selected' : '').'>is not set</option>
 					</select>
 				</span>
 				<span>
@@ -492,6 +504,11 @@ class FilterWidget extends Widget
 			$filterSessionArray[self::ADDITIONAL_COLUMNS] = array();
 		}
 
+		if (!isset($filterSessionArray[self::FILTER_ID]))
+		{
+			$filterSessionArray[self::FILTER_ID] = -1;
+		}
+
 		$this->session->set_userdata(self::SESSION_NAME, $filterSessionArray);
 	}
 
@@ -962,6 +979,8 @@ class FilterWidget extends Widget
 			$filterSessionArray[self::ACTIVE_FILTERS_OPTION]
 		);
 
+		$filterSessionArray[self::FILTER_ID] = $this->filterId;
+
 		$this->session->set_userdata(self::SESSION_NAME, $filterSessionArray);
 	}
 
@@ -1001,61 +1020,68 @@ class FilterWidget extends Widget
 
 			foreach ($activeFilters as $field => $activeFilterValue)
 			{
-				if (trim($activeFilterValue) != '')
+				if ($first)
 				{
-					if ($first)
+					$first = false;
+				}
+				else
+				{
+					$where .= ' AND ';
+				}
+
+				if (isset($activeFiltersOperation[$field]))
+				{
+					$where .= '"'.$field.'"';
+					$condition = '';
+
+					switch ($activeFiltersOperation[$field])
 					{
-						$first = false;
-					}
-					else
-					{
-						$where .= ' AND ';
+						case self::OP_EQUAL:
+							if (!is_numeric($activeFilterValue)) $activeFilterValue = 0;
+							$condition = ' = '.$activeFilterValue;
+							break;
+						case self::OP_NOT_EQUAL:
+							if (!is_numeric($activeFilterValue)) $activeFilterValue = 0;
+							$condition = ' != '.$activeFilterValue;
+							break;
+						case self::OP_GREATER_THAN:
+							if (!is_numeric($activeFilterValue)) $activeFilterValue = 0;
+							$condition = ' > '.$activeFilterValue;
+							break;
+						case self::OP_LESS_THAN:
+							if (!is_numeric($activeFilterValue)) $activeFilterValue = 0;
+							if (isset($activeFiltersOption[$field])
+								&& ($activeFiltersOption[$field] == self::OPT_DAYS
+								|| $activeFiltersOption[$field] == self::OPT_MONTHS))
+							{
+								$condition = ' < (NOW() - \''.$activeFilterValue.' '.$activeFiltersOption[$field].'\'::interval)';
+							}
+							else
+							{
+								$condition = ' < '.$activeFilterValue;
+							}
+							break;
+						case self::OP_CONTAINS:
+							$condition = ' ILIKE \'%'.$activeFilterValue.'%\'';
+							break;
+						case self::OP_NOT_CONTAINS:
+							$condition = ' NOT ILIKE \'%'.$activeFilterValue.'%\'';
+							break;
+						case self::OP_IS_TRUE:
+							$condition = ' IS TRUE';
+							break;
+						case self::OP_IS_FALSE:
+							$condition = ' IS FALSE';
+							break;
+						case self::OP_SET:
+							$condition = ' IS NOT NULL';
+							break;
+						case self::OP_NOT_SET:
+							$condition = ' IS NULL';
+							break;
 					}
 
-					if (isset($activeFiltersOperation[$field]))
-					{
-						$where .= '"'.$field.'"';
-						$condition = '';
-
-						switch ($activeFiltersOperation[$field])
-						{
-							case self::OP_EQUAL:
-								$condition = ' = '.$activeFilterValue;
-								break;
-							case self::OP_NOT_EQUAL:
-								$condition = ' != '.$activeFilterValue;
-								break;
-							case self::OP_GREATER_THAN:
-								$condition = ' > '.$activeFilterValue;
-								break;
-							case self::OP_LESS_THAN:
-								if (isset($activeFiltersOption[$field])
-									&& ($activeFiltersOption[$field] == self::OPT_DAYS
-									|| $activeFiltersOption[$field] == self::OPT_MONTHS))
-								{
-									$condition = ' < (NOW() - \''.$activeFilterValue.' '.$activeFiltersOption[$field].'\'::interval)';
-								}
-								else
-								{
-									$condition = ' < '.$activeFilterValue;
-								}
-								break;
-							case self::OP_CONTAINS:
-								$condition = ' ILIKE \'%'.$activeFilterValue.'%\'';
-								break;
-							case self::OP_NOT_CONTAINS:
-								$condition = ' NOT ILIKE \'%'.$activeFilterValue.'%\'';
-								break;
-							case self::OP_IS_TRUE:
-								$condition = ' IS TRUE';
-								break;
-							case self::OP_IS_FALSE:
-								$condition = ' IS FALSE';
-								break;
-						}
-
-						$where .= $condition;
-					}
+					$where .= $condition;
 				}
 			}