Check for menu before trying to use it as object.

Use only if $menu is there.

diff --git a/setup/adminHooks.php b/setup/adminHooks.php
index 2886dbd..2f167d2 100644 (file)
--- a/setup/adminHooks.php
+++ b/setup/adminHooks.php
@@ -109,8 +109,10 @@ $locations = get_theme_mod( 'nav_menu_locations' );
 if(!empty($locations))
 {
     $menu = get_term_by('name', $menuName, 'nav_menu');
-    $locations[$menuSlug] = $menu->term_id;
-    set_theme_mod('nav_menu_locations', $locations);
+    if ( $menu ) {
+        $locations[$menuSlug] = $menu->term_id;
+        set_theme_mod('nav_menu_locations', $locations);
+    }
 }
 
 add_action( 'add_meta_boxes', function() {