diff --git a/renderdoc/driver/d3d11/d3d11_debug.cpp b/renderdoc/driver/d3d11/d3d11_debug.cpp
index 5be10b7c2..868e19fe0 100644
--- a/renderdoc/driver/d3d11/d3d11_debug.cpp
+++ b/renderdoc/driver/d3d11/d3d11_debug.cpp
@@ -753,11 +753,16 @@ void D3D11DebugManager::FillWithDiscardPattern(DiscardType type, ID3D11Resource
     for(UINT z = 0; z < RDCMAX(1U, desc.Depth >> subresource); z++)
       FillWithDiscardPattern(type, res, z, subresource, pRect, NumRects);
   }
-  else
+  else if(WrappedID3D11Buffer::IsAlloc(res))
   {
     // buffer
     FillWithDiscardPattern(type, res, 0, 0, pRect, NumRects);
   }
+  else
+  {
+    RDCERR("Unknown resource type being discarded");
+    return;
+  }
 }
 
 void D3D11DebugManager::FillWithDiscardPattern(DiscardType type, ID3D11View *view,
@@ -784,6 +789,11 @@ void D3D11DebugManager::FillWithDiscardPattern(DiscardType type, ID3D11View *vie
   {
     range = ResourceRange((WrappedID3D11DepthStencilView *)view);
   }
+  else
+  {
+    RDCERR("Unknown view type being discarded");
+    return;
+  }
 
   ID3D11Resource *res = range.GetResource();
   UINT numMips = 1;
@@ -810,6 +820,11 @@ void D3D11DebugManager::FillWithDiscardPattern(DiscardType type, ID3D11View *vie
     numMips = desc.MipLevels;
     tex3D = true;
   }
+  else
+  {
+    RDCERR("View of unknown resource type being discarded");
+    return;
+  }
 
   rdcarray<D3D11_RECT> rects;
   rects.assign(pRect, NumRects);