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-rw-r--r--src/lib/image.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/lib/image.cc b/src/lib/image.cc
index 4c60fe888..2167918f8 100644
--- a/src/lib/image.cc
+++ b/src/lib/image.cc
@@ -351,6 +351,8 @@ Image::scale (dcp::Size out_size, dcp::YUVToRGB yuv_to_rgb, AVPixelFormat out_fo
(fast ? SWS_FAST_BILINEAR : SWS_BICUBIC) | SWS_ACCURATE_RND, 0, 0, 0
);
+ DCPOMATIC_ASSERT(scale_context);
+
DCPOMATIC_ASSERT (yuv_to_rgb < dcp::YUVToRGB::COUNT);
EnumIndexedVector<int, dcp::YUVToRGB> lut;
lut[dcp::YUVToRGB::REC601] = SWS_CS_ITU601;