Fix yet another typo
diff --git a/xos/services/vpn/admin.py b/xos/services/vpn/admin.py
index 67c7728..63ad0e4 100644
--- a/xos/services/vpn/admin.py
+++ b/xos/services/vpn/admin.py
@@ -100,7 +100,7 @@
             self.instance.script = str(time.time()) + ".vpn"
 
         if (not self.instance.ca_crt):
-            self.generate_ca_crt()
+            self.instance.ca_crt = self.generate_ca_crt()
 
         if ((not self.instance.server_crt) or (not self.instance.server_key)):
             self.generate_server_credentials()