diff --git a/peer/data.peer.tf b/peer/data.peer.tf
index e69980a..8a5d8c6 100644
--- a/peer/data.peer.tf
+++ b/peer/data.peer.tf
@@ -34,7 +34,7 @@ data "aws_route_table" "peer_route_table" {
 }
 
 locals {
-  peer_subnet_associations = flatten([for rt in data.aws_route_table.peer_route_table : [for a in rt.associations : a.subnet_id]])
+  peer_subnet_associations = flatten([for rt in data.aws_route_table.peer_route_table : [for a in rt.associations : a.subnet_id if a.subnet_id != ""]])
   peer_subnets             = [for sn in data.aws_subnet.peer_subnets : sn.id if length(regexall("public", sn.tags.Name)) == 0]
 }
 
diff --git a/peer/data.self.tf b/peer/data.self.tf
index ee9e247..43080b5 100644
--- a/peer/data.self.tf
+++ b/peer/data.self.tf
@@ -34,7 +34,7 @@ data "aws_route_table" "self_route_table" {
 }
 
 locals {
-  self_subnet_associations = flatten([for rt in data.aws_route_table.self_route_table : [for a in rt.associations : a.subnet_id]])
+  self_subnet_associations = flatten([for rt in data.aws_route_table.self_route_table : [for a in rt.associations : a.subnet_id if a.subnet_id != ""]])
   self_subnets             = [for sn in data.aws_subnet.self_subnets : sn.id if length(regexall("public", sn.tags.Name)) == 0]
 }