diff --git a/extensions/Servers/Proxmox/Livewire/Firewall.php b/extensions/Servers/Proxmox/Livewire/Firewall.php
index 9aa16123a..4a9a5ebb8 100644
--- a/extensions/Servers/Proxmox/Livewire/Firewall.php
+++ b/extensions/Servers/Proxmox/Livewire/Firewall.php
@@ -213,7 +213,7 @@ class Firewall extends Component
         }
         
         // Set default interface to first network adapter
-        if (!empty($this->networkAdapters)) {
+        if (!empty($this->networkAdapters) && isset($this->networkAdapters[0]) && isset($this->networkAdapters[0]['name'])) {
             $this->ruleIface = $this->networkAdapters[0]['name'];
         }