diff --git a/randr/rroutput.c b/randr/rroutput.c
index 091e06b8a..fbd0e32b3 100644
--- a/randr/rroutput.c
+++ b/randr/rroutput.c
@@ -546,7 +546,8 @@ ProcRRSetOutputPrimary(ClientPtr client)
     }
 
     pScrPriv = rrGetScrPriv(pWin->drawable.pScreen);
-    RRSetPrimaryOutput(pWin->drawable.pScreen, pScrPriv, output);
+    if (pScrPriv)
+        RRSetPrimaryOutput(pWin->drawable.pScreen, pScrPriv, output);
 
     return Success;
 }
diff --git a/randr/rrscreen.c b/randr/rrscreen.c
index f570afaf4..55110e088 100644
--- a/randr/rrscreen.c
+++ b/randr/rrscreen.c
@@ -248,6 +248,9 @@ ProcRRSetScreenSize(ClientPtr client)
 
     pScreen = pWin->drawable.pScreen;
     pScrPriv = rrGetScrPriv(pScreen);
+    if (!pScrPriv)
+        return BadMatch;
+
     if (stuff->width < pScrPriv->minWidth || pScrPriv->maxWidth < stuff->width) {
         client->errorValue = stuff->width;
         return BadValue;