diff --git a/content/search-results.php b/content/search-results.php
index 3422303..35d9097 100644
--- a/content/search-results.php
+++ b/content/search-results.php
@@ -1,5 +1,7 @@
 <?php
-session_start();
+if (session_status() === PHP_SESSION_NONE) {
+    session_start();
+}
  
 $results = $_SESSION["search_results"] ?? [];
 $query = $_SESSION["search_query"] ?? "";
diff --git a/index.php b/index.php
index 01b726e..175830a 100644
--- a/index.php
+++ b/index.php
@@ -1,5 +1,7 @@
 <?php
-session_start();
+if (session_status() === PHP_SESSION_NONE) {
+    session_start();
+}
 ob_start();
 
 $pfad = $_GET["pfad"] ?? "home";
diff --git a/php/controller/createArticle-controller.php b/php/controller/createArticle-controller.php
index a39a409..53c7f3a 100644
--- a/php/controller/createArticle-controller.php
+++ b/php/controller/createArticle-controller.php
@@ -1,5 +1,7 @@
 <?php
-SESSION_START();
+if (session_status() === PHP_SESSION_NONE) {
+    session_start();
+}
 require_once '../model/LocalArticleManager.php';
 require_once '../model/ArticleManager.php';
 require_once '../validator/article-validator.php';
diff --git a/php/controller/home-controller.php b/php/controller/home-controller.php
index 517c079..d9f6006 100644
--- a/php/controller/home-controller.php
+++ b/php/controller/home-controller.php
@@ -1,5 +1,7 @@
 <?php
-session_start();
+if (session_status() === PHP_SESSION_NONE) {
+    session_start();
+}
 require_once 'php/model/Article.php';
 require_once 'php/model/ArticleManager.php';
 require_once 'php/model/LocalArticleManager.php';
diff --git a/php/controller/search-results-controller.php b/php/controller/search-results-controller.php
index 161c874..422f923 100644
--- a/php/controller/search-results-controller.php
+++ b/php/controller/search-results-controller.php
@@ -1,5 +1,7 @@
 <?php
-session_start();
+if (session_status() === PHP_SESSION_NONE) {
+    session_start();
+}
 require_once '../model/LocalArticleManager.php';
 require_once '../model/ArticleManager.php';
 require_once '../model/Article.php';
diff --git a/php/controller/showArticle-controller.php b/php/controller/showArticle-controller.php
index 38bb3f2..cff0483 100644
--- a/php/controller/showArticle-controller.php
+++ b/php/controller/showArticle-controller.php
@@ -1,5 +1,8 @@
 <?php
-session_start();
+if (session_status() === PHP_SESSION_NONE) {
+    session_start();
+}
+
 require_once 'php/model/Article.php';
 require_once 'php/model/ArticleManager.php';
 
diff --git a/php/controller/updateArticle-controller.php b/php/controller/updateArticle-controller.php
index 0e0bfd1..cc881fd 100644
--- a/php/controller/updateArticle-controller.php
+++ b/php/controller/updateArticle-controller.php
@@ -1,5 +1,8 @@
 <?php
-SESSION_START();
+if (session_status() === PHP_SESSION_NONE) {
+    session_start();
+}
+
 require_once '../model/LocalArticleManager.php';
 require_once '../model/ArticleManager.php';
 require_once '../model/Article.php';
diff --git a/php/validator/article-validator.php b/php/validator/article-validator.php
index 02c4f94..d708258 100644
--- a/php/validator/article-validator.php
+++ b/php/validator/article-validator.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Prüft, ob der Autor auch der Eigentümer des Beitrags ist.
  * @param $author