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-rw-r--r--vcl/win/gdi/gdiimpl.cxx2
1 files changed, 1 insertions, 1 deletions
diff --git a/vcl/win/gdi/gdiimpl.cxx b/vcl/win/gdi/gdiimpl.cxx
index 2d86dbeed08b..dc16217155bb 100644
--- a/vcl/win/gdi/gdiimpl.cxx
+++ b/vcl/win/gdi/gdiimpl.cxx
@@ -2310,7 +2310,7 @@ bool WinSalGraphicsImpl::drawTransformedBitmap(
const SalBitmap* pAlphaBitmap)
{
assert(dynamic_cast<const WinSalBitmap*>(&rSourceBitmap));
- assert(dynamic_cast<const WinSalBitmap*>(pAlphaBitmap));
+ assert(!pAlphaBitmap || dynamic_cast<const WinSalBitmap*>(pAlphaBitmap));
const WinSalBitmap& rSalBitmap = static_cast< const WinSalBitmap& >(rSourceBitmap);
const WinSalBitmap* pSalAlpha = static_cast< const WinSalBitmap* >(pAlphaBitmap);