diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 03c6c96..9b8e1e7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -37,9 +37,9 @@ stages:
     # Build the image
     - 'make build-container DOCKER_REPOSITORY=$REGISTRY_BASE_URL/$DOCKER_IMAGE_NAME DOCKER_TAG=$CI_COMMIT_SHA'
   rules:
-  - if: '$REGISTRY_BASE_URL == ""'
+  - if: '$REGISTRY_BASE_URL == null'
     when: never
-  - if: '$DOCKER_IMAGE_NAME == ""'
+  - if: '$DOCKER_IMAGE_NAME == null'
     when: never
 
 "Publish Docker Image":
@@ -58,9 +58,9 @@ stages:
     # Clean local image
     - 'docker image rm $REGISTRY_BASE_URL/$DOCKER_IMAGE_NAME:$CI_COMMIT_SHA'
   rules:
-  - if: '$REGISTRY_BASE_URL == ""'
+  - if: '$REGISTRY_BASE_URL == null'
     when: never
-  - if: '$DOCKER_IMAGE_NAME == ""'
+  - if: '$DOCKER_IMAGE_NAME == null'
     when: never
 
 "Deploy to Production":
@@ -73,15 +73,15 @@ stages:
   script:
     - 'kubectl --kubeconfig=$K8S_CONFIG -n $K8S_NAMESPACE set image $K8S_DEPLOYMENT_TARGET $K8S_DEPLOYMENT_CONTAINER=$REGISTRY_BASE_URL/$DOCKER_IMAGE_NAME:$CI_COMMIT_SHA'
   rules:
-  - if: '$K8S_CONFIG == ""'
+  - if: '$K8S_CONFIG == null'
     when: never
-  - if: '$K8S_NAMESPACE == ""'
+  - if: '$K8S_NAMESPACE == null'
     when: never
-  - if: '$K8S_DEPLOYMENT_TARGET == ""'
+  - if: '$K8S_DEPLOYMENT_TARGET == null'
     when: never
-  - if: '$K8S_DEPLOYMENT_CONTAINER == ""'
+  - if: '$K8S_DEPLOYMENT_CONTAINER == null'
     when: never
-  - if: '$REGISTRY_BASE_URL == ""'
+  - if: '$REGISTRY_BASE_URL == null'
     when: never
-  - if: '$DOCKER_IMAGE_NAME == ""'
+  - if: '$DOCKER_IMAGE_NAME == null'
     when: never