diff --git a/main.tf b/main.tf
index 86609ce..6fabfc7 100644
--- a/main.tf
+++ b/main.tf
@@ -24,9 +24,9 @@ locals {
       error_service          = module.buckets[bucket].default_custom_error_response_policy.error_service
     }
   }
-  backend_paths          = merge(local.cloud_run_backend_paths, local.bucket_backend_paths)
-  custom_error_responses = merge(local.cloud_run_default_custom_error_responses, local.bucket_default_custom_error_responses)
-  url_map_name           = var.url_map_name == "" ? "${var.name_prefix}-lb" : var.url_map_name
+  backend_paths                  = merge(local.cloud_run_backend_paths, local.bucket_backend_paths)
+  default_custom_error_responses = merge(local.cloud_run_default_custom_error_responses, local.bucket_default_custom_error_responses)
+  url_map_name                   = var.url_map_name == "" ? "${var.name_prefix}-lb" : var.url_map_name
 }
 
 # Global IP
@@ -130,6 +130,7 @@ resource "google_compute_url_map" "urlmap" {
       path_matcher = host_rule.key
     }
   }
+
   dynamic "path_matcher" {
     for_each = merge(var.services, var.buckets)
     content {
@@ -152,16 +153,19 @@ resource "google_compute_url_map" "urlmap" {
           }
         }
       }
-      default_custom_error_response_policy {
-        dynamic "error_response_rule" {
-          for_each = coalesce(local.custom_error_responses[path_matcher.key].custom_error_responses, [])
-          content {
-            match_response_codes   = error_response_rule.value.match_response_codes
-            path                   = error_response_rule.value.path
-            override_response_code = error_response_rule.value.override_response_code
+      dynamic "default_custom_error_response_policy" {
+        for_each = local.default_custom_error_responses[path_matcher.key] != null ? [local.default_custom_error_responses[path_matcher.key]] : []
+        content {
+          dynamic "error_response_rule" {
+            for_each = default_custom_error_response_policy.value.custom_error_responses != null ? default_custom_error_response_policy.value.custom_error_responses : []
+            content {
+              match_response_codes   = error_response_rule.value.match_response_codes
+              path                   = error_response_rule.value.path
+              override_response_code = error_response_rule.value.override_response_code
+            }
           }
+          error_service = default_custom_error_response_policy.value.error_service
         }
-        error_service = local.custom_error_responses[path_matcher.key].error_service
       }
     }
   }
diff --git a/variables.tf b/variables.tf
index fd1ff5e..0177b05 100644
--- a/variables.tf
+++ b/variables.tf
@@ -87,7 +87,7 @@ variable "default_custom_error_response_policy" {
     }))
     error_service = optional(string)
   })
-  default = {}
+  default = null
 }
 
 variable "buckets" {
@@ -173,7 +173,7 @@ variable "services" {
           override_response_code = optional(number)
         })))
         error_service = optional(string)
-      }), {})
+      }))
       iap_config = optional(object({
         enable               = bool
         oauth2_client_id     = optional(string)