diff --git a/src/com/mirantis/system_qa/SharedPipeline.groovy b/src/com/mirantis/system_qa/SharedPipeline.groovy
index 0d4c5e3..dae2ce4 100644
--- a/src/com/mirantis/system_qa/SharedPipeline.groovy
+++ b/src/com/mirantis/system_qa/SharedPipeline.groovy
@@ -289,6 +289,7 @@
                 string(name: 'TCP_QA_REFS', value: "${tcp_qa_refs}"),
                 string(name: 'PIPELINE_LIBRARY_REF', value: "${pipeline_library_ref}"),
                 string(name: 'MK_PIPELINES_REF', value: "${mk_pipelines_ref}"),
+                string(name: 'SALT_MODELS_SYSTEM_REF_CHANGE', value: env.SALT_MODELS_SYSTEM_REF_CHANGE ?: ''),
                 string(name: 'COOKIECUTTER_TEMPLATE_COMMIT', value: "${cookiecutter_template_commit}"),
                 string(name: 'SALT_MODELS_SYSTEM_COMMIT', value: "${salt_models_system_commit}"),
                 string(name: 'COOKIECUTTER_REF_CHANGE', value: "${cookiecutter_ref_change}"),
@@ -445,7 +446,7 @@
                 string(name: 'DOMAIN_NAME', value: "${LAB_CONFIG_NAME}.local"),
                 string(name: 'REPOSITORY_SUITE', value: "${env.MCP_VERSION}"),
                 string(name: 'SALT_MODELS_SYSTEM_COMMIT', value: "${saltmodels_system_commit}"),
-                string(name: 'SALT_MODELS_SYSTEM_REF_CHANGE', value: env.SALT_MODELS_SYSTEM_REF_CHANGE),
+                string(name: 'SALT_MODELS_SYSTEM_REF_CHANGE', value: env.SALT_MODELS_SYSTEM_REF_CHANGE ?: ''),
                 string(name: 'COOKIECUTTER_TEMPLATE_COMMIT', value: "${cookiecuttertemplate_commit}"),
                 string(name: 'COOKIECUTTER_REF_CHANGE', value: "${cookiecutter_ref_change}"),
                 string(name: 'ENVIRONMENT_TEMPLATE_REF_CHANGE', value: "${environment_template_ref_change}"),
@@ -499,6 +500,7 @@
                 string(name: 'DEPLOY_NETWORK_NETMASK', value: "${deploy_network_mask}"),
                 string(name: 'PIPELINE_LIBRARY_REF', value: "${pipeline_library_ref}"),
                 string(name: 'MK_PIPELINES_REF', value: "${mk_pipelines_ref}"),
+                string(name: 'SALT_MODELS_SYSTEM_REF_CHANGE', value: env.SALT_MODELS_SYSTEM_REF_CHANGE ?: ''),
                 string(name: 'TCP_QA_REFS', value: "${tcp_qa_refs}"),
                 string(name: 'UPDATE_VERSION', value: "${update_version}"),
                 string(name: 'MCP_COMMON_SCRIPTS_REFS', value: "${mcp_common_scripts_ref}"),