diff --git a/toonz/sources/toonzqt/studiopaletteviewer.cpp b/toonz/sources/toonzqt/studiopaletteviewer.cpp
index bb6b00e..1ba4e37 100644
--- a/toonz/sources/toonzqt/studiopaletteviewer.cpp
+++ b/toonz/sources/toonzqt/studiopaletteviewer.cpp
@@ -1050,6 +1050,8 @@ void StudioPaletteTreeViewer::dropEvent(QDropEvent *event) {
 
   resetDropItem();
 
+  if (newPath.isEmpty()) return;
+
   const QMimeData *mimeData      = event->mimeData();
   const PaletteData *paletteData = dynamic_cast<const PaletteData *>(mimeData);
   if (paletteData) {