diff --git a/src/radeon_display.c b/src/radeon_display.c
index d501cdc..2e856c6 100644
--- a/src/radeon_display.c
+++ b/src/radeon_display.c
@@ -2188,6 +2188,9 @@ static void RADEONDPMSSetOn(ScrnInfoPtr pScrn, RADEONConnector *pPort)
   RADEONTmdsType TmdsType;
   RADEONDacType DacType;
 
+  if (!pPort)
+    return;
+
   MonType = pPort->MonType;
   TmdsType = pPort->TMDSType;
   DacType = pPort->DACType;
@@ -2226,6 +2229,9 @@ static void RADEONDPMSSetOff(ScrnInfoPtr pScrn, RADEONConnector *pPort)
   RADEONDacType DacType;
   unsigned long tmpPixclksCntl;
 
+  if (!pPort)
+    return;
+
   MonType = pPort->MonType;
   TmdsType = pPort->TMDSType;
   DacType = pPort->DACType;