From 6992f5421f8222e1edf872a8788d88016ba46f2b Mon Sep 17 00:00:00 2001
From: Peter Johnson <johnson.peter@gmail.com>
Date: Sun, 3 Feb 2019 00:22:07 -0800
Subject: [PATCH] cscore: Avoid crash if invalid (null) source set in
 MjpegServer (#1585)

Fixes robotpy/robotpy-cscore#60
---
 cscore/src/main/native/cpp/MjpegServerImpl.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cscore/src/main/native/cpp/MjpegServerImpl.cpp b/cscore/src/main/native/cpp/MjpegServerImpl.cpp
index 9dd6f33c7d..f548f9c61a 100644
--- a/cscore/src/main/native/cpp/MjpegServerImpl.cpp
+++ b/cscore/src/main/native/cpp/MjpegServerImpl.cpp
@@ -111,13 +111,13 @@ class MjpegServerImpl::ConnThread : public wpi::SafeThread {
 
   void StartStream() {
     std::lock_guard<wpi::mutex> lock(m_mutex);
-    m_source->EnableSink();
+    if (m_source) m_source->EnableSink();
     m_streaming = true;
   }
 
   void StopStream() {
     std::lock_guard<wpi::mutex> lock(m_mutex);
-    m_source->DisableSink();
+    if (m_source) m_source->DisableSink();
     m_streaming = false;
   }
 };