diff --git a/sabre/dav/lib/CalDAV/ICSExportPlugin.php b/sabre/dav/lib/CalDAV/ICSExportPlugin.php
index fc8b971f3..9b6093fbe 100644
--- a/sabre/dav/lib/CalDAV/ICSExportPlugin.php
+++ b/sabre/dav/lib/CalDAV/ICSExportPlugin.php
@@ -318,7 +318,9 @@ function mergeObjects(array $properties, array $inputObjects) {
                     // VTIMEZONE is special, because we need to filter out the duplicates
                     case 'VTIMEZONE' :
                         // Naively just checking tzid.
-                        if (in_array((string)$child->TZID, $collectedTimezones)) continue;
+                        if (in_array((string)$child->TZID, $collectedTimezones)) {
+                            break;
+                        }
 
                         $timezones[] = clone $child;
                         $collectedTimezones[] = $child->TZID;
diff --git a/sabre/dav/lib/DAV/CorePlugin.php b/sabre/dav/lib/DAV/CorePlugin.php
index 676cdd04a..03b31db8a 100644
--- a/sabre/dav/lib/DAV/CorePlugin.php
+++ b/sabre/dav/lib/DAV/CorePlugin.php
@@ -321,7 +321,7 @@ function httpPropFind(RequestInterface $request, ResponseInterface $response) {
             try {
                 $propFindXml = $this->server->xml->expect('{DAV:}propfind', $requestBody);
             } catch (ParseException $e) {
-                throw new BadRequest($e->getMessage(), null, $e);
+                throw new BadRequest($e->getMessage(), 0, $e);
             }
         } else {
             $propFindXml = new Xml\Request\PropFind();
@@ -378,7 +378,7 @@ function httpPropPatch(RequestInterface $request, ResponseInterface $response) {
         try {
             $propPatch = $this->server->xml->expect('{DAV:}propertyupdate', $request->getBody());
         } catch (ParseException $e) {
-            throw new BadRequest($e->getMessage(), null, $e);
+            throw new BadRequest($e->getMessage(), 0, $e);
         }
         $newProperties = $propPatch->properties;
 
diff --git a/sabre/vobject/lib/Component/VCard.php b/sabre/vobject/lib/Component/VCard.php
index bca623d5e..2a2851f4e 100644
--- a/sabre/vobject/lib/Component/VCard.php
+++ b/sabre/vobject/lib/Component/VCard.php
@@ -511,7 +511,7 @@ function xmlSerialize(Xml\Writer $writer) {
                 switch ($property->name) {
 
                     case 'VERSION':
-                        continue;
+                        break;
 
                     case 'XML':
                         $value = $property->getParts();
diff --git a/sabre/vobject/lib/FreeBusyGenerator.php b/sabre/vobject/lib/FreeBusyGenerator.php
index e30b136c4..ca77cb918 100644
--- a/sabre/vobject/lib/FreeBusyGenerator.php
+++ b/sabre/vobject/lib/FreeBusyGenerator.php
@@ -430,7 +430,7 @@ protected function calculateBusy(FreeBusyData $fbData, array $objects) {
                                 // instance. We are skipping this event from the output
                                 // entirely.
                                 unset($this->objects[$key]);
-                                continue;
+                                break;
                             }
 
                             if ($this->start) {