From df2e659f3d1ef17abba563c23410927d5de3bdff Mon Sep 17 00:00:00 2001
From: Jason J <iam@ovrhere.com>
Date: Tue, 6 Oct 2015 18:19:32 -0400
Subject: [PATCH] [Fix]: Fixed NullPointer for GB Slider invalidate

In version 2.3.3 the Slider throws a
NullPointerException during invalidate. Added
null check to remedy this.
---
 .../src/main/java/com/gc/materialdesign/views/Slider.java     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/MaterialDesignLibrary/MaterialDesign/src/main/java/com/gc/materialdesign/views/Slider.java b/MaterialDesignLibrary/MaterialDesign/src/main/java/com/gc/materialdesign/views/Slider.java
index 9fc435b..78e78ef 100644
--- a/MaterialDesignLibrary/MaterialDesign/src/main/java/com/gc/materialdesign/views/Slider.java
+++ b/MaterialDesignLibrary/MaterialDesign/src/main/java/com/gc/materialdesign/views/Slider.java
@@ -94,7 +94,9 @@ public void run() {
 
     @Override
     public void invalidate() {
-        ball.invalidate();
+        if (ball != null) {
+            ball.invalidate();
+        }
         super.invalidate();
     }