From 06321b8e87da7ad2ef81e357cb23a58b55e88618 Mon Sep 17 00:00:00 2001
From: Austin Shalit <austinshalit@gmail.com>
Date: Tue, 18 Jul 2017 19:34:45 -0700
Subject: [PATCH] Fix encoder sourceA null check (#579)

---
 wpilibj/src/athena/java/edu/wpi/first/wpilibj/Encoder.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wpilibj/src/athena/java/edu/wpi/first/wpilibj/Encoder.java b/wpilibj/src/athena/java/edu/wpi/first/wpilibj/Encoder.java
index b92979fdee..8d28b08909 100644
--- a/wpilibj/src/athena/java/edu/wpi/first/wpilibj/Encoder.java
+++ b/wpilibj/src/athena/java/edu/wpi/first/wpilibj/Encoder.java
@@ -277,7 +277,7 @@ public class Encoder extends SensorBase implements CounterBase, PIDSource, LiveW
     m_allocatedA = false;
     m_allocatedB = false;
     m_allocatedI = false;
-    if (sourceB == null) {
+    if (sourceA == null) {
       throw new NullPointerException("Digital Source A was null");
     }
     m_aSource = sourceA;