diff --git a/lib/addressbook.php b/lib/addressbook.php
index 73b30e94..634d59eb 100644
--- a/lib/addressbook.php
+++ b/lib/addressbook.php
@@ -71,10 +71,15 @@ class OC_Contacts_Addressbook{
 	 * @return associative array
 	 */
 	public static function find($id){
-		$stmt = OCP\DB::prepare( 'SELECT * FROM *PREFIX*contacts_addressbooks WHERE id = ?' );
-		$result = $stmt->execute(array($id));
-
-		return $result->fetchRow();
+		try {
+			$stmt = OCP\DB::prepare( 'SELECT * FROM *PREFIX*contacts_addressbooks WHERE id = ?' );
+			$result = $stmt->execute(array($id));
+			return $result->fetchRow();
+		} catch(Exception $e) {
+			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', exception: '.$e->getMessage(), OCP\Util::ERROR);
+			OCP\Util::writeLog('contacts', __CLASS__.'::'.__METHOD__.', id: '.$id, OCP\Util::DEBUG);
+			return false;
+		}
 	}
 
 	/**
@@ -171,7 +176,7 @@ class OC_Contacts_Addressbook{
 		$prefbooks = OCP\Config::getUserValue($uid,'contacts','openaddressbooks',null);
 		$prefbooks = explode(';',$prefbooks);
 		for ($i = 0; $i < count($prefbooks); $i++) {
-			if(!self::find($prefbooks[$i])) {
+			if(!$prefbooks[$i] || !self::find($prefbooks[$i])) {
 				unset($prefbooks[$i]);
 			}
 		}
@@ -207,16 +212,15 @@ class OC_Contacts_Addressbook{
 		try {
 			$stmt = OCP\DB::prepare( $prep );
 			$result = $stmt->execute($active);
+			while( $row = $result->fetchRow()){
+				$addressbooks[] = $row;
+			}
 		} catch(Exception $e) {
 			OCP\Util::writeLog('contacts','OC_Contacts_Addressbook:active:, exception: '.$e->getMessage(),OCP\Util::DEBUG);
 			OCP\Util::writeLog('contacts','OC_Contacts_Addressbook:active, ids: '.join(',', $active),OCP\Util::DEBUG);
 			OCP\Util::writeLog('contacts','OC_Contacts_Addressbook::active, SQL:'.$prep,OCP\Util::DEBUG);
 		}
 
-		while( $row = $result->fetchRow()){
-			$addressbooks[] = $row;
-		}
-
 		return $addressbooks;
 	}
 
@@ -239,7 +243,7 @@ class OC_Contacts_Addressbook{
 			if(!in_array($id, $openaddressbooks)) {
 				$openaddressbooks[] = $id;
 			}
-		} else { 
+		} else {
 			if(in_array($id, $openaddressbooks)) {
 				unset($openaddressbooks[array_search($id, $openaddressbooks)]);
 			}
diff --git a/lib/vcard.php b/lib/vcard.php
index 28686433..7c8dbd2e 100644
--- a/lib/vcard.php
+++ b/lib/vcard.php
@@ -62,6 +62,9 @@ class OC_Contacts_VCard{
 			}
 		} elseif($id) {
 			if(is_array($id)) {
+				if(count($id) == 0) {
+					return array();
+				}
 				$id = $id[0];
 			}
 			try {
@@ -110,7 +113,7 @@ class OC_Contacts_VCard{
 		return $result->fetchRow();
 	}
 
-	/** 
+	/**
 	* @brief Format property TYPE parameters for upgrading from v. 2.1
 	* @param $property Reference to a Sabre_VObject_Property.
 	* In version 2.1 e.g. a phone can be formatted like: TEL;HOME;CELL:123456789
@@ -126,7 +129,7 @@ class OC_Contacts_VCard{
 		}
 	}
 
-	/** 
+	/**
 	* @brief Decode properties for upgrading from v. 2.1
 	* @param $property Reference to a Sabre_VObject_Property.
 	* The only encoding allowed in version 3.0 is 'b' for binary. All encoded strings