diff --git a/app/src/main/java/com/annimon/hotarufx/exceptions/KeyFrameDuplicationException.java b/app/src/main/java/com/annimon/hotarufx/exceptions/KeyFrameDuplicationException.java
deleted file mode 100644
index 90f5fdd..0000000
--- a/app/src/main/java/com/annimon/hotarufx/exceptions/KeyFrameDuplicationException.java
+++ /dev/null
@@ -1,10 +0,0 @@
-package com.annimon.hotarufx.exceptions;
-
-import com.annimon.hotarufx.visual.KeyFrame;
-
-public class KeyFrameDuplicationException extends RuntimeException {
-
-    public KeyFrameDuplicationException(KeyFrame keyFrame) {
-        super("Key frame " + keyFrame.getFrame() + " already exists in timeline");
-    }
-}
diff --git a/app/src/main/java/com/annimon/hotarufx/visual/PropertyTimeline.java b/app/src/main/java/com/annimon/hotarufx/visual/PropertyTimeline.java
index d19015e..bc45d18 100644
--- a/app/src/main/java/com/annimon/hotarufx/visual/PropertyTimeline.java
+++ b/app/src/main/java/com/annimon/hotarufx/visual/PropertyTimeline.java
@@ -1,11 +1,9 @@
 package com.annimon.hotarufx.visual;
 
-import com.annimon.hotarufx.exceptions.KeyFrameDuplicationException;
 import java.util.Map;
 import java.util.TreeMap;
 import javafx.beans.value.WritableValue;
 import lombok.Getter;
-import lombok.val;
 
 @Getter
 public class PropertyTimeline<T> {
@@ -19,10 +17,7 @@ public class PropertyTimeline<T> {
     }
 
     public PropertyTimeline<T> add(KeyFrame keyFrame, T value) {
-        val previous = keyFrames.put(keyFrame, value);
-        if (previous != null) {
-            throw new KeyFrameDuplicationException(keyFrame);
-        }
+        keyFrames.put(keyFrame, value);
         return this;
     }
 }