diff --git a/cicd-lab-pipeline.groovy b/cicd-lab-pipeline.groovy
index 83c7b59..3475298 100644
--- a/cicd-lab-pipeline.groovy
+++ b/cicd-lab-pipeline.groovy
@@ -132,9 +132,9 @@
         retry(30) {
             out = salt.cmdRun(saltMaster, 'I@docker:swarm:role:master', """/bin/bash -c 'docker service ls | grep -E "0/[0-9]+"' && echo 'Some services are not running'""")
             for (int a = 0; a < out['return'].size(); a++) {
-                def entry = out['return'][a]
+                def entry = out['return'].get(a)
                 for (int i = 0; i < entry.size(); i++) {
-                    def node = entry[i]
+                    def node = entry.get(i)
                     if (node.value =~ /Some services are not running/) {
                         sleep(10)
                         throw new Exception("$node.key: $node.value")