--- a/gfx/layers/d3d11/TextureD3D11.cpp
+++ b/gfx/layers/d3d11/TextureD3D11.cpp
@@ -168,16 +168,19 @@ TextureClientD3D11::~TextureClientD3D11(
     UnlockD3DTexture(mTexture.get());
   }
 #endif
 }
 
 bool
 TextureClientD3D11::Lock(OpenMode aMode)
 {
+  if (!mTexture) {
+    return false;
+  }
   MOZ_ASSERT(!mIsLocked, "The Texture is already locked!");
   LockD3DTexture(mTexture.get());
   mIsLocked = true;
 
   if (mNeedsClear) {
     mDrawTarget = GetAsDrawTarget();
     mDrawTarget->ClearRect(Rect(0, 0, GetSize().width, GetSize().height));
     mNeedsClear = false;
@@ -185,16 +188,17 @@ TextureClientD3D11::Lock(OpenMode aMode)
 
   return true;
 }
 
 void
 TextureClientD3D11::Unlock()
 {
   MOZ_ASSERT(mIsLocked, "Unlocked called while the texture is not locked!");
+
   if (mDrawTarget) {
     // see the comment on TextureClientDrawTarget::GetAsDrawTarget.
     // This DrawTarget is internal to the TextureClient and is only exposed to the
     // outside world between Lock() and Unlock(). This assertion checks that no outside
     // reference remains by the time Unlock() is called.
     MOZ_ASSERT(mDrawTarget->refCount() == 1);
     mDrawTarget->Flush();
   }
@@ -205,16 +209,20 @@ TextureClientD3D11::Unlock()
   mIsLocked = false;
 }
 
 TemporaryRef<DrawTarget>
 TextureClientD3D11::GetAsDrawTarget()
 {
   MOZ_ASSERT(mIsLocked, "Calling TextureClient::GetAsDrawTarget without locking :(");
 
+  if (!mTexture) {
+    return nullptr;
+  }
+
   if (mDrawTarget) {
     return mDrawTarget;
   }
 
   mDrawTarget = Factory::CreateDrawTargetForD3D10Texture(mTexture, mFormat);
   return mDrawTarget;
 }