From 9e76c4ecf73f342b0ab7d217b9630f0fb1f09133 Mon Sep 17 00:00:00 2001
From: tombuildsstuff <git@ibuildstuff.co.uk>
Date: Tue, 17 Jul 2018 13:27:30 +0200
Subject: [PATCH] Load Balancer: making the `subnet_id` a nilable field

Fixes https://github.com/terraform-providers/terraform-provider-azurerm/issues/1470#issuecomment-405547487
---
 azurerm/resource_arm_loadbalancer.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/azurerm/resource_arm_loadbalancer.go b/azurerm/resource_arm_loadbalancer.go
index 9c2ecd016cf6..fa6ed9d053a3 100644
--- a/azurerm/resource_arm_loadbalancer.go
+++ b/azurerm/resource_arm_loadbalancer.go
@@ -66,7 +66,7 @@ func resourceArmLoadBalancer() *schema.Resource {
 							Type:         schema.TypeString,
 							Optional:     true,
 							Computed:     true,
-							ValidateFunc: azure.ValidateResourceID,
+							ValidateFunc: azure.ValidateResourceIDOrEmpty,
 						},
 
 						"private_ip_address": {