diff --git a/gui/mainwindow.cpp b/gui/mainwindow.cpp
index 3744f520c58f..75250bc444d5 100644
--- a/gui/mainwindow.cpp
+++ b/gui/mainwindow.cpp
@@ -907,12 +907,10 @@ bool MainWindow::tryLoadLibrary(Library *library, const QString& filename)
 
 void MainWindow::loadAddon(Settings &settings, const QString &filesDir, const QString &pythonCmd, const QString& addon)
 {
-    QString addonFilePath = ProjectFile::getAddonFilePath(filesDir, addon);
+    const QString addonFilePath = fromNativePath(ProjectFile::getAddonFilePath(filesDir, addon));
     if (addonFilePath.isEmpty())
         return; // TODO: report an error
 
-    addonFilePath.replace(QChar('\\'), QChar('/'));
-
     picojson::object obj;
     obj["script"] = picojson::value(addonFilePath.toStdString());
     if (!pythonCmd.isEmpty())
diff --git a/lib/errorlogger.cpp b/lib/errorlogger.cpp
index fbb635c691df..112a2592f081 100644
--- a/lib/errorlogger.cpp
+++ b/lib/errorlogger.cpp
@@ -42,6 +42,7 @@
 const std::set<std::string> ErrorLogger::mCriticalErrorIds{
     "cppcheckError",
     "cppcheckLimit",
+    "fileNotFound",
     "internalAstError",
     "instantiationError",
     "internalError",