diff --git a/app.py b/app.py
index cdad18b..f6d3cf8 100644
--- a/app.py
+++ b/app.py
@@ -162,6 +162,8 @@ def open_file(self, file_name=None, file_dir=None):
         if error:
             self.output_console.print_output(error["msg"])
 
+        mpl_plot_vertical = self.findChild(MplPlotVertical, "mpl_plot_vertical")
+
         if isinstance(plot_data, PlotPoints):
             self.plot_points = plot_data
             self.output_console.print_output(
@@ -174,13 +176,16 @@ def open_file(self, file_name=None, file_dir=None):
             if not mpl_plot_vertical:
                 self.add_vertical_settings()
                 mpl_plot_vertical = self.findChild(MplPlotVertical, "mpl_plot_vertical")
-            mpl_plot_vertical.set_new_file(
-                filename=self.plot_horizo.filename.split("/")[-1]
-            )
+
             self.output_console.print_output(
                 f"{len(self.plot_horizo.names)} functions."
             )
 
+        if mpl_plot_vertical:
+            mpl_plot_vertical.set_new_file(
+                filename=self.plot_horizo.filename.split("/")[-1]
+            )
+
         self.canvas_plot.update_plot()
         self.last_file_open = file_to_open