diff --git a/src/View/MainWindow.py b/src/View/MainWindow.py
index 35605c38eedb1d84e4fa4d93a28e25d03532eb09..5a25143896ce50d28fc532f3bebd3fb4ac2d7da0 100644
--- a/src/View/MainWindow.py
+++ b/src/View/MainWindow.py
@@ -1578,6 +1578,8 @@ class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
         if run.exec():
             results = self.diff_results(run.solver1,
                                         run.solver2)
+        else:
+            return
 
         # At least one result not available
         if results is None: