diff --git a/dlls/quartz/filtergraph.c b/dlls/quartz/filtergraph.c
index 26a40807e24..e0474fc2408 100644
--- a/dlls/quartz/filtergraph.c
+++ b/dlls/quartz/filtergraph.c
@@ -913,6 +913,9 @@ static HRESULT WINAPI FilterGraph2_Connect(IFilterGraph2 *iface, IPin *ppinOut,
 
     TRACE("(%p/%p)->(%p, %p)\n", This, iface, ppinOut, ppinIn);
 
+    if(!ppinOut || !ppinIn)
+        return E_POINTER;
+
     if (TRACE_ON(quartz))
     {
         hr = IPin_QueryPinInfo(ppinIn, &PinInfo);