diff --git a/header.php b/header.php
index f990546..2c9ae79 100644
--- a/header.php
+++ b/header.php
@@ -9,41 +9,43 @@ require 'functions.php';
 // be named "require_login() and take no parameters
 require 'authfunctions.php';
 
-// Start the session
-session_name(SESSIONCOMICS);
-session_start();
+if ( php_sapi_name() != "cli" ) {
+    // Start the session
+    session_name(SESSIONCOMICS);
+    session_start();
 
-// This session variable is TRUE when successfully logged in
-// If set to true, and using default authentication, no login will be required
-if ( !isset($_SESSION['validated']) ) {
-   $_SESSION['validated'] = false;
-}
+    // This session variable is TRUE when successfully logged in
+    // If set to true, and using default authentication, no login will be required
+    if ( !isset($_SESSION['validated']) ) {
+    $_SESSION['validated'] = false;
+    }
 
-// This session variable is set to the current browsing folder.
-// It is relative to the COMICSDIR constant defined in variables.php
-if ( !isset($_SESSION['compath']) ) {
-   $_SESSION['compath'] = '/';
-}
-if ( $_SESSION['compath'] == "" ) $_SESSION['compath'] = "/";
+    // This session variable is set to the current browsing folder.
+    // It is relative to the COMICSDIR constant defined in variables.php
+    if ( !isset($_SESSION['compath']) ) {
+    $_SESSION['compath'] = '/';
+    }
+    if ( $_SESSION['compath'] == "" ) $_SESSION['compath'] = "/";
 
-// This session variable is set to the current comic in Base64
-if ( !isset($_SESSION['comfile']) ) {
-   $_SESSION['comfile'] = "";
-}
+    // This session variable is set to the current comic in Base64
+    if ( !isset($_SESSION['comfile']) ) {
+    $_SESSION['comfile'] = "";
+    }
 
-// Initialize the hash session variable used for SSO
-// Set the hash to the passed in value if it exists
-if ( !isset($_SESSION['hash']) ) {
-   $_SESSION['hash'] = "";
-}
-if ( isset($_REQUEST['hash']) ) {
-   $_SESSION['hash'] = $_REQUEST['hash'];
-}
+    // Initialize the hash session variable used for SSO
+    // Set the hash to the passed in value if it exists
+    if ( !isset($_SESSION['hash']) ) {
+    $_SESSION['hash'] = "";
+    }
+    if ( isset($_REQUEST['hash']) ) {
+    $_SESSION['hash'] = $_REQUEST['hash'];
+    }
 
-// Sorting for folders.
-// Valid values (from constants): SORTBYNAME, SORTBYDATE
-if ( !isset($_SESSION['sortorder']) ) {
-   $_SESSION['sortorder'] = SORTBYDATE;
+    // Sorting for folders.
+    // Valid values (from constants): SORTBYNAME, SORTBYDATE
+    if ( !isset($_SESSION['sortorder']) ) {
+    $_SESSION['sortorder'] = SORTBYDATE;
+    }
 }
 
 // Make our PDO database connection which will be used in all scripts