diff --git a/lab-pipeline.groovy b/lab-pipeline.groovy
index c488210..499c615 100644
--- a/lab-pipeline.groovy
+++ b/lab-pipeline.groovy
@@ -97,6 +97,7 @@
                         if (env.BUILD_USER_ID && !env.BUILD_USER_ID.equals("jenkins")) {
                             def existingStacks = openstack.getStacksForNameContains(openstackCloud, "${env.BUILD_USER_ID}-${JOB_NAME}", openstackEnv)
                             if(existingStacks.size() >= _MAX_PERMITTED_STACKS){
+                                HEAT_STACK_DELETE = "false"
                                 throw new Exception("You cannot create new stack, you already have ${_MAX_PERMITTED_STACKS} stacks of this type (${JOB_NAME}). \nStack names: ${existingStacks}")
                             }
                         }