diff --git a/modules/managers/outputs.tf b/modules/managers/outputs.tf
index 26f6450..d507b38 100644
--- a/modules/managers/outputs.tf
+++ b/modules/managers/outputs.tf
@@ -9,13 +9,13 @@ output "ipv4_addresses_private" {
 }
 
 output "manager_token" {
-  value       = "${lookup(data.external.swarm_tokens.result, "manager", "")}"
+  value       = "${data.external.swarm_tokens.result != "" ? lookup(data.external.swarm_tokens.result, "manager", "") : ""}"
   description = "The Docker Swarm manager join token"
   sensitive   = true
 }
 
 output "worker_token" {
-  value       = "${lookup(data.external.swarm_tokens.result, "worker", "")}"
+  value       = "${data.external.swarm_tokens.result != "" ? lookup(data.external.swarm_tokens.result, "worker", "") : ""}"
   description = "The Docker Swarm worker join token"
   sensitive   = true
 }