diff --git a/src/main/java/seedu/address/model/event/UniqueEventList.java b/src/main/java/seedu/address/model/event/UniqueEventList.java
index 96d1b98ea9c..1646a8b068f 100644
--- a/src/main/java/seedu/address/model/event/UniqueEventList.java
+++ b/src/main/java/seedu/address/model/event/UniqueEventList.java
@@ -164,7 +164,7 @@ private Event getOverlappingEvent(Event newEvent) {
         LocalDateTime newEventStartTime = newEvent.getStartTime();
         LocalDateTime newEventEndTime = newEvent.getEndTime();
 
-        assert newEventStartTime != null: "Start time should not be null";
+        assert newEventStartTime != null : "Start time should not be null";
 
         if (newEventEndTime == null) {
             newEventEndTime = newEventStartTime;
@@ -174,7 +174,7 @@ private Event getOverlappingEvent(Event newEvent) {
             LocalDateTime startTime = e.getStartTime();
             LocalDateTime endTime = e.getEndTime();
 
-            assert startTime != null: "Start time should not be null";
+            assert startTime != null : "Start time should not be null";
 
             if (endTime == null) {
                 endTime = startTime;