diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index da39868d1fb32aa1beddfe089630d6854963fbe4..28d502c417828847fb035afec9c07d8ed50e2759 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -40,7 +40,6 @@ linting:
   stage: test
   script:
     - make pylint
-  allow_failure: true
 
 # run qunit tests
 test:
diff --git a/src/doc/concepts.rst b/src/doc/concepts.rst
deleted file mode 100644
index 23e5fc4f6ddb666757fb9c79e192e07ffed8fb44..0000000000000000000000000000000000000000
--- a/src/doc/concepts.rst
+++ /dev/null
@@ -1,6 +0,0 @@
-========================
-The concepts of pycaosdb
-========================
-
-Some text...
-
diff --git a/src/doc/index.rst b/src/doc/index.rst
index eab31e859ac4d747934458ce23a39772c44e1ca4..5ed1f417a7456157fa8a0c6905fbd1d7be5d513d 100644
--- a/src/doc/index.rst
+++ b/src/doc/index.rst
@@ -9,7 +9,6 @@ Welcome to the documentation of LinkAhead's web UI!
 
    Manual installation <install>
    Tutorials <tutorials/index>
-   Concepts <concepts>
    administration/index.rst
    Extending the UI <extension>
    API <api/index>
@@ -19,8 +18,9 @@ Welcome to the documentation of LinkAhead's web UI!
    Go to `demo.indiscale.com <https://demo.indiscale.com>`__ and take the interactive tour to learn
    how to use LinkAhead's web interface.
 
-This documentation helps you to :doc:`install the web UI <install>`, explains the most important
-:doc:`concepts<concepts>` and offers a range of :doc:`tutorials<tutorials/index>`.
+This documentation helps you to :doc:`install the web UI <install>`, explains
+the most important concepts and offers a range of
+:doc:`tutorials<tutorials/index>`.
 
 
 Indices and tables
diff --git a/src/server_side_scripting/ext_table_preview/pandas_table_preview.py b/src/server_side_scripting/ext_table_preview/pandas_table_preview.py
index d144c2709f872825803ecb4d99b2b5ff38817a68..13c9b394648548bd6124de8a7318b18bb8a9221c 100755
--- a/src/server_side_scripting/ext_table_preview/pandas_table_preview.py
+++ b/src/server_side_scripting/ext_table_preview/pandas_table_preview.py
@@ -96,7 +96,7 @@ def read_file(fipath, ftype):
     return df
 
 
-def create_table_preview(fi):
+def create_table_preview(fi, entity_id):
     if not ending_is_valid(fi.path):
         print("Cannot create preview for Entity with ID={}, because download"
               "failed.".format(fi.id), file=sys.stderr)
@@ -142,4 +142,4 @@ if __name__ == "__main__":
 
     fi = get_file(entity_id)
 
-    create_table_preview(fi)
+    create_table_preview(fi, entity_id)