diff --git a/template/_footer.php b/template/_footer.php
index 17ffe3b..3bcc763 100644
--- a/template/_footer.php
+++ b/template/_footer.php
@@ -1,5 +1,4 @@
 <?php
-if(!isset($_SESSION)) session_start();
 include_once("templateParameters.php");
 
 if ($templateParameters["render"] === FALSE) {
diff --git a/template/_header.php b/template/_header.php
index c620ce7..ed6e600 100644
--- a/template/_header.php
+++ b/template/_header.php
@@ -1,14 +1,6 @@
 <?php
-if(!isset($_SESSION)) session_start();
 include_once("templateParameters.php");
 
-// When including this template from other directories, using relative url paths is not sufficient. Therefore we use a prefix to ensure that the correct url path is given.
-// Typically we put this before any local urls, such as navigation, icons etc to ensure that they use the correct path.
-$templateUrlPrefix = dirname(str_replace(realpath($_SERVER['DOCUMENT_ROOT']), '', realpath(__DIR__)));
-if ((strlen($templateUrlPrefix) > 1)) {
-    $templateUrlPrefix = htmlspecialchars($templateUrlPrefix . DIRECTORY_SEPARATOR);
-}
-
 if ($templateParameters["render"] === FALSE) {
     return;
 }
diff --git a/template/templateParameters.php b/template/templateParameters.php
index 676f826..581cf4c 100644
--- a/template/templateParameters.php
+++ b/template/templateParameters.php
@@ -1,4 +1,6 @@
 <?php
+if(!isset($_SESSION)) session_start();
+
 // Default parameter values if none is defined
 $defaultTemplateParameters = [
     "title" => "Document", // Set page title
@@ -9,3 +11,12 @@ $defaultTemplateParameters = [
 foreach(array_keys($defaultTemplateParameters) as $key) {
     if (!isset($templateParameters[$key])) $templateParameters[$key] = $defaultTemplateParameters[$key];
 }
+
+// When including a template from other directories, using relative url paths is not sufficient. Therefore we use a prefix to ensure that the correct url path is given.
+// Typically we put this before any local urls, such as navigation, icons etc to ensure that they use the correct path.
+if (empty($templateUrlPrefix)) {
+    $templateUrlPrefix = dirname(str_replace(realpath($_SERVER['DOCUMENT_ROOT']), '', realpath(__DIR__)));
+    if ((strlen($templateUrlPrefix) > 1)) {
+        $templateUrlPrefix = htmlspecialchars($templateUrlPrefix . DIRECTORY_SEPARATOR);
+    }
+}
\ No newline at end of file