diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index eacbe3e26323e0a0bf1579cba53e2e12ecfd27c0..4a59b5b91edbe7a918a80884cf9e38a5d70a8826 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -21,6 +21,7 @@ version:
   artifacts:
     name: pages
     when: always
+    expire_in: 1 week
     paths:
       - badges/
 
@@ -54,6 +55,7 @@ tests (from scratch):
   artifacts:
     name: pages
     when: always
+    expire_in: 1 week
     paths:
       - badges/
       - test_results/
@@ -107,6 +109,7 @@ tests:
   artifacts:
     name: pages
     when: always
+    expire_in: 1 week
     paths:
       - badges/
       - test_results/
@@ -131,6 +134,7 @@ coverage:
   artifacts:
     name: pages
     when: always
+    expire_in: 1 week
     paths:
       - badges/
       - coverage/
@@ -155,6 +159,7 @@ sphinx docs:
   artifacts:
     name: pages
     when: always
+    expire_in: 1 week
     paths:
       - badges/
       - webpage/
@@ -189,6 +194,7 @@ pages:
   artifacts:
     name: pages
     when: always
+    expire_in: 1 week
     paths:
       - public
       - badges/
diff --git a/mlair/run_modules/experiment_setup.py b/mlair/run_modules/experiment_setup.py
index 524d29b8cc5adda337cf80866071c1697253300f..aca5f583bff181281aee9104df6750da61ad4f93 100644
--- a/mlair/run_modules/experiment_setup.py
+++ b/mlair/run_modules/experiment_setup.py
@@ -389,6 +389,10 @@ class ExperimentSetup(RunEnvironment):
         self._set_param("neighbors", ["DEBW030"])  # TODO: just for testing
 
         # set competitors
+        if model_display_name is not None and model_display_name in competitors:
+            raise IndexError(f"Given model_display_name {model_display_name} is also present in the competitors "
+                             f"variable {competitors}. To assure a proper workflow it is required to have unique names "
+                             f"for each model and competitor. Please use a different model display name or competitor.")
         self._set_param("competitors", competitors, default=[])
         competitor_path_default = os.path.join(self.data_store.get("data_path"), "competitors",
                                                "_".join(self.data_store.get("target_var")))