diff --git a/extras/src/main/java/edu/umd/cs/piccolox/activities/PPositionPathActivity.java b/extras/src/main/java/edu/umd/cs/piccolox/activities/PPositionPathActivity.java
index 6e923d6..d48ea29 100644
--- a/extras/src/main/java/edu/umd/cs/piccolox/activities/PPositionPathActivity.java
+++ b/extras/src/main/java/edu/umd/cs/piccolox/activities/PPositionPathActivity.java
@@ -51,7 +51,7 @@
     }
 
     public PPositionPathActivity(final long duration, final long stepRate, final Target aTarget) {
-        this(duration, stepRate, aTarget, null, null);
+        this(duration, stepRate, aTarget, null, new Point2D[0]);
     }
 
     public PPositionPathActivity(final long duration, final long stepRate, final Target aTarget, final float[] knots,