Commit 59ec312c for libheif

commit 59ec312c374ebcdb39fb99916bd965ba124a2445
Author: Dirk Farin <dirk.farin@gmail.com>
Date:   Tue May 19 01:10:26 2026 +0200

    fix querying decoder image without pushing data first

diff --git a/libheif/codecs/decoder.cc b/libheif/codecs/decoder.cc
index 44450e45..7baa4cce 100644
--- a/libheif/codecs/decoder.cc
+++ b/libheif/codecs/decoder.cc
@@ -461,6 +461,14 @@ Result<std::shared_ptr<HeifPixelImage> > Decoder::get_decoded_frame(const heif_d
     return pluginErr;
   }

+  // The plugin's per-decoder context is created lazily on the first push of
+  // compressed data. If a caller polls for a frame before any data was pushed
+  // (e.g. when a sequence advances into a new chunk that uses a freshly-
+  // allocated decoder), there is nothing buffered yet — return nullptr.
+  if (!m_decoder) {
+    return {nullptr};
+  }
+
   heif_image* decoded_img = nullptr;

   heif_error err;