diff --git a/NppJSONViewer/NppJsonViewer/JsonViewDlg.cpp b/NppJSONViewer/NppJsonViewer/JsonViewDlg.cpp
index bb515a7..3ad0b9f 100644
--- a/NppJSONViewer/NppJsonViewer/JsonViewDlg.cpp
+++ b/NppJSONViewer/NppJsonViewer/JsonViewDlg.cpp
@@ -181,8 +181,10 @@ void JsonViewDlg::PopulateTreeUsingSax(HTREEITEM tree_root, const std::string &j
             ShowMessage(JSON_ERROR_TITLE, (JSON_ERR_VALIDATE + StringHelper::ToWstring(err)).c_str(), MB_OK | MB_ICONERROR);
         }
     }
-
-    m_Editor->SetLangAsJson();
+    else
+    {
+        m_Editor->SetLangAsJson();
+    }
 }
 
 HTREEITEM JsonViewDlg::InsertToTree(HTREEITEM parent, const std::string &text)
diff --git a/NppJSONViewer/NppJsonViewer/ScintillaEditor.cpp b/NppJSONViewer/NppJsonViewer/ScintillaEditor.cpp
index 5cb312c..37e31da 100644
--- a/NppJSONViewer/NppJsonViewer/ScintillaEditor.cpp
+++ b/NppJSONViewer/NppJsonViewer/ScintillaEditor.cpp
@@ -39,7 +39,7 @@ std::string ScintillaEditor::GetJsonText()
 
 void ScintillaEditor::SetLangAsJson() const
 {
-    ::SendMessage(m_hScintilla, NPPM_SETCURRENTLANGTYPE, 0, LangType::L_JSON);
+    ::SendMessage(m_NppData._nppHandle, NPPM_SETCURRENTLANGTYPE, 0, LangType::L_JSON);
 }
 
 bool ScintillaEditor::IsJsonFile() const