From f8b806be01ac38fddb3e0a6d01eaab12e61c37e0 Mon Sep 17 00:00:00 2001
From: Matthew Frahry <mbfrahry@gmail.com>
Date: Mon, 20 Apr 2020 16:22:27 -0700
Subject: [PATCH] =?UTF-8?q?`resource=5Farm=5Fapplication=5Fgateway`=20-=20?=
 =?UTF-8?q?Fix=20crash=20in=20`backend=5Faddr=E2=80=A6=20(#6549)?=
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---
 .../services/network/resource_arm_application_gateway.go       | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/azurerm/internal/services/network/resource_arm_application_gateway.go b/azurerm/internal/services/network/resource_arm_application_gateway.go
index c9d718885d07..341126d93371 100644
--- a/azurerm/internal/services/network/resource_arm_application_gateway.go
+++ b/azurerm/internal/services/network/resource_arm_application_gateway.go
@@ -116,7 +116,8 @@ func resourceArmApplicationGateway() *schema.Resource {
 							Optional: true,
 							MinItems: 1,
 							Elem: &schema.Schema{
-								Type: schema.TypeString,
+								Type:         schema.TypeString,
+								ValidateFunc: validation.NoZeroValues,
 							},
 						},