From bea481803020412ba5583c040516932870e7d3d3 Mon Sep 17 00:00:00 2001
From: Doug Binks <doug@enkisoftware.com>
Date: Sat, 8 Sep 2018 18:00:19 +0200
Subject: [PATCH] X11: Add NULL checks in work area retrieval

Related to #1322.
---
 src/x11_monitor.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/x11_monitor.c b/src/x11_monitor.c
index d0aa9f9c..e924d366 100644
--- a/src/x11_monitor.c
+++ b/src/x11_monitor.c
@@ -350,10 +350,15 @@ void _glfwPlatformGetMonitorWorkarea(_GLFWmonitor* monitor, int* xpos, int* ypos
 
         _glfwGetWindowPropertyX11(_glfw.x11.root, _glfw.x11.NET_WORKAREA, XA_CARDINAL, (unsigned char**) &extents);
 
-        *xpos = extents[0];
-        *ypos = extents[1];
-        *width = extents[2];
-        *height = extents[3];
+        if (xpos)
+            *xpos = extents[0];
+        if (xpos)
+            *ypos = extents[1];
+        if (xpos)
+            *width = extents[2];
+        if (xpos)
+            *height = extents[3];
+
         XFree(extents);
     }
 }