Fix for crash in FPDF_GetNamedDest().

fpdfsdk/src/fpdfview.cpp

Index: fpdfsdk/src/fpdfview.cpp
diff --git a/fpdfsdk/src/fpdfview.cpp b/fpdfsdk/src/fpdfview.cpp
index 43feaf4d5a9154999eb40c893fbe60ef5b59337a..219e458c7a8876c57b3da2e7af4ca95aaf2b0b6c 100644
--- a/fpdfsdk/src/fpdfview.cpp
+++ b/fpdfsdk/src/fpdfview.cpp
@@ -850,7 +850,7 @@ DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document, int index,
     if (!pDestObj) return NULL;
     if (pDestObj->GetType() == PDFOBJ_DICTIONARY)
         pDestObj = ((CPDF_Dictionary*)pDestObj)->GetArray(FX_BSTRC("D"));
-    if (pDestObj->GetType() != PDFOBJ_ARRAY) return NULL;
+    if (!pDestObj || pDestObj->GetType() != PDFOBJ_ARRAY) return NULL;
     CFX_WideString wsName = PDF_DecodeText(bsName);
     CFX_ByteString utf16Name = wsName.UTF16LE_Encode();
     unsigned int len = utf16Name.GetLength();