diff --git a/bootstrap.php b/bootstrap.php
index 85d158a..40ce32a 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -1,6 +1,8 @@
 <?php
 
-add_action( 'after_setup_theme', 'eig_module_sso_register' );
+if ( function_exists( 'add_action' ) ) {
+	add_action( 'after_setup_theme', 'eig_module_sso_register' );
+}
 
 /**
  * Register the single sign-on module
@@ -25,4 +27,4 @@ function eig_module_sso_load() {
 	add_action( 'wp_ajax_nopriv_sso-check', 'eig_sso_handler' );
 	add_action( 'wp_ajax_sso-check', 'eig_sso_handler' );
 
-}
\ No newline at end of file
+}