diff --git a/PCK-Studio/MainForm.cs b/PCK-Studio/MainForm.cs
index a4010b49..d83e34d1 100644
--- a/PCK-Studio/MainForm.cs
+++ b/PCK-Studio/MainForm.cs
@@ -1445,6 +1445,9 @@ namespace PckStudio
 
             // Retrieve the node at the drop location.
             TreeNode targetNode = treeViewMain.GetNodeAt(targetPoint);
+			if (targetNode is null)
+				return;
+
 			bool isTargetPckFile = targetNode.IsTagOfType<PckFileData>();
 
 			if (e.Data.GetData(dataFormat) is not TreeNode draggedNode)