diff --git a/src/Handler/Course/List.hs b/src/Handler/Course/List.hs
index 98618f45e..f6c63d741 100644
--- a/src/Handler/Course/List.hs
+++ b/src/Handler/Course/List.hs
@@ -51,10 +51,10 @@ resultMayEditCourse = _dbrOutput . _5
 type CourseTableExpr = (E.SqlExpr (Entity Course) `E.InnerJoin` E.SqlExpr (Entity School))
 
 queryCourse :: IndexPreservingGetter CourseTableExpr (E.SqlExpr (Entity Course))
-queryCourse = to $ $(E.sqlIJproj 2 1)
+queryCourse = to $(E.sqlIJproj 2 1)
 
 querySchool :: IndexPreservingGetter CourseTableExpr (E.SqlExpr (Entity School))
-querySchool = to $ $(E.sqlIJproj 2 2)
+querySchool = to $(E.sqlIJproj 2 2)
 
 queryParticipants :: IndexPreservingGetter CourseTableExpr (E.SqlExpr (E.Value Int))
 queryParticipants = queryCourse . to (E.^. CourseId) . to numCourseParticipants
diff --git a/src/Handler/Course/ParticipantInvite.hs b/src/Handler/Course/ParticipantInvite.hs
index fab7884ca..99b874430 100644
--- a/src/Handler/Course/ParticipantInvite.hs
+++ b/src/Handler/Course/ParticipantInvite.hs
@@ -261,7 +261,7 @@ registerUser  cid (_avsIdent, Just uid) = exceptT return return $ do
 upsertNewTutorial :: CourseId -> TutorialIdent -> Handler TutorialId
 upsertNewTutorial cid tutorialName = do
   now <- liftIO getCurrentTime
-  tutId <- runDB $ do
+  runDB $ do
     Entity tutId _ <- upsert
       Tutorial
         { tutorialCourse = cid
@@ -284,7 +284,6 @@ upsertNewTutorial cid tutorialName = do
       ]
     audit $ TransactionTutorialEdit tutId
     return tutId
-  return tutId
 
 registerTutorialMembers :: TutorialId -> Set UserId -> Handler ()
 registerTutorialMembers tutId (Set.toList -> users) = runDB $ do
diff --git a/src/Handler/Course/Register.hs b/src/Handler/Course/Register.hs
index 01ed75cee..028e5d4ac 100644
--- a/src/Handler/Course/Register.hs
+++ b/src/Handler/Course/Register.hs
@@ -52,7 +52,7 @@ courseRegisterForm (Entity cid Course{..}) = liftHandler $ do
           = BtnCourseDeregister
           | otherwise
           = BtnCourseRegister
-      isRegistered = btn `elem` [BtnCourseDeregister]
+      isRegistered = btn == BtnCourseDeregister
   return . (, btn) . wFormToAForm $ do
     MsgRenderer mr <- getMsgRenderer
 
diff --git a/src/Utils/Course.hs b/src/Utils/Course.hs
index a6859458f..2446ac190 100644
--- a/src/Utils/Course.hs
+++ b/src/Utils/Course.hs
@@ -132,9 +132,8 @@ courseIsVisible :: UTCTime
                 -> E.SqlExpr (Entity Course)
                 -> E.SqlExpr (E.Value Bool)
 courseIsVisible now course = 
-  (E.maybe E.false (\visibleFrom -> visibleFrom E.<=. E.val now) (course E.^. CourseVisibleFrom)
+  E.maybe E.false (\visibleFrom -> visibleFrom E.<=. E.val now) (course E.^. CourseVisibleFrom)
     E.&&. E.maybe E.true (\visibleTo -> E.val now E.<=. visibleTo) (course E.^. CourseVisibleTo)
-  )
 
 courseIsVisible' :: UTCTime
                  -> Entity Course