diff --git a/core/fpdfapi/render/cpdf_dibbase.cpp b/core/fpdfapi/render/cpdf_dibbase.cpp
index b325edb..322e76a 100644
--- a/core/fpdfapi/render/cpdf_dibbase.cpp
+++ b/core/fpdfapi/render/cpdf_dibbase.cpp
@@ -291,14 +291,16 @@
   if (m_Status == LoadState::kContinue)
     return ContinueLoadMaskDIB(pPause);
 
-  if (m_Status == LoadState::kFail)
-    return LoadState::kFail;
-
   ByteString decoder = m_pStreamAcc->GetImageDecoder();
   if (decoder == "JPXDecode")
     return LoadState::kFail;
 
-  ASSERT(decoder == "JBIG2Decode");
+  if (decoder != "JBIG2Decode")
+    return LoadState::kSuccess;
+
+  if (m_Status == LoadState::kFail)
+    return LoadState::kFail;
+
   FXCODEC_STATUS iDecodeStatus;
   CCodec_Jbig2Module* pJbig2Module = CPDF_ModuleMgr::Get()->GetJbig2Module();
   if (!m_pJbig2Context) {
diff --git a/testing/resources/pixel/bug_1236_expected.pdf.0.png b/testing/resources/pixel/bug_1236_expected.pdf.0.png
index 114e34a..2020fec 100644
--- a/testing/resources/pixel/bug_1236_expected.pdf.0.png
+++ b/testing/resources/pixel/bug_1236_expected.pdf.0.png
Binary files differ