diff --git a/reader/document/Model.cpp b/reader/document/Model.cpp
index 03b981f72..09dbd8718 100644
--- a/reader/document/Model.cpp
+++ b/reader/document/Model.cpp
@@ -160,6 +160,7 @@ deepin_reader::Document *deepin_reader::DocumentFactory::getDocument(const int &
         if (!file.copy(targetDoc)) {
             qCritical() << "Failed to copy file from" << filePath << "to" << targetDoc;
             error = deepin_reader::Document::ConvertFailed;
+            *pprocess = nullptr;
             return nullptr;
         }