Fixed crash

tools/editortool/map/chunkpanel.py

@@ -36,7 +36,11 @@ class ChunkPanel(QWidget):
     QTreeWidgetItem(parentItem2, ["Tile C"])
     QTreeWidgetItem(parentItem2, ["Tile D"])
     self.tree.expandAll()  # Expand by default, remove if you want collapsed
-    layout.addWidget(self.tree, 1)  # Give tree stretch factor so it expands
+    layout.addWidget(self.tree)  # Removed invalid stretch factor
+
+    # Add stretch so tree expands
+    layout.setStretchFactor(grid, 0)
+    layout.setStretchFactor(self.tree, 1)
 
     # Event subscriptions
     self.btnN.clicked.connect(lambda: self.parent.map.moveRelative(0, -1, 0))