diff --git a/cloud-deploy-pipeline.groovy b/cloud-deploy-pipeline.groovy
index 50a9e54..6683910 100644
--- a/cloud-deploy-pipeline.groovy
+++ b/cloud-deploy-pipeline.groovy
@@ -216,7 +216,7 @@
 
 
         // Set up override params
-        if (env.getEnvironment().containsKey('SALT_OVERRIDES')) {
+        if (common.validInputParam('SALT_OVERRIDES')) {
             stage('Set Salt overrides') {
                 salt.setSaltOverrides(saltMaster,  SALT_OVERRIDES)
             }
@@ -415,12 +415,12 @@
         // Clean
         //
 
-        if (env.getEnvironment().containsKey('STACK_NAME') && STACK_NAME != '') {
+        if (common.validInputParam('STACK_NAME')) {
             // send notification
             common.sendNotification(currentBuild.result, STACK_NAME, ["slack"])
         }
 
-        if (env.getEnvironment().containsKey('STACK_DELETE') && STACK_DELETE.toBoolean() == true) {
+        if (common.validInputParam('STACK_DELETE') && STACK_DELETE.toBoolean() == true) {
             stage('Trigger cleanup job') {
                 common.errorMsg('Stack cleanup job triggered')
                 build(job: STACK_CLEANUP_JOB, parameters: [
@@ -440,7 +440,7 @@
             if (currentBuild.result == 'FAILURE') {
                 common.errorMsg("Deploy job FAILED and was not deleted. Please fix the problem and delete stack on you own.")
 
-                if (env.getEnvironment().containsKey('SALT_MASTER_URL')) {
+                if (common.validInputParam('SALT_MASTER_URL')) {
                     common.errorMsg("Salt master URL: ${SALT_MASTER_URL}")
                 }
             }