Fix nullptr crash in handleVSyncChanged

1 files changed, 8 insertions, 5 deletions

diff --git a/indra/newview/llviewercontrol.cpp b/indra/newview/llviewercontrol.cpp
index cd6e780aa8..862bb3dfa9 100644
--- a/indra/newview/llviewercontrol.cpp
+++ b/indra/newview/llviewercontrol.cpp
@@ -263,12 +263,15 @@ static bool handleAnisotropicChanged(const LLSD& newvalue)
 static bool handleVSyncChanged(const LLSD& newvalue)
 {
     LLPerfStats::tunables.vsyncEnabled = newvalue.asBoolean();
-    gViewerWindow->getWindow()->toggleVSync(newvalue.asBoolean());
-
-    if (newvalue.asBoolean())
+    if (gViewerWindow && gViewerWindow->getWindow())
     {
-        U32 current_target = gSavedSettings.getU32("TargetFPS");
-        gSavedSettings.setU32("TargetFPS", std::min((U32)gViewerWindow->getWindow()->getRefreshRate(), current_target));
+        gViewerWindow->getWindow()->toggleVSync(newvalue.asBoolean());
+
+        if (newvalue.asBoolean())
+        {
+            U32 current_target = gSavedSettings.getU32("TargetFPS");
+            gSavedSettings.setU32("TargetFPS", std::min((U32)gViewerWindow->getWindow()->getRefreshRate(), current_target));
+        }
     }
 
     return true;