diff --git a/src/main/kotlin/org/mosad/thecitadelofricks/controller/CacheController.kt b/src/main/kotlin/org/mosad/thecitadelofricks/controller/CacheController.kt
index 5cc1a83..87f8784 100644
--- a/src/main/kotlin/org/mosad/thecitadelofricks/controller/CacheController.kt
+++ b/src/main/kotlin/org/mosad/thecitadelofricks/controller/CacheController.kt
@@ -88,7 +88,7 @@ class CacheController {
             }
 
             val key = "$courseName-$weekIndex"
-            return if (timetableList.contains(key)) {
+            return if (timetableList.containsKey(key)) {
                 timetableList[key]!!
             } else {
                 val timetableLink = courseList.courses[courseName]