diff --git a/src/gui_qt/fit/result.py b/src/gui_qt/fit/result.py
index 4ad9e48..7c4b85c 100644
--- a/src/gui_qt/fit/result.py
+++ b/src/gui_qt/fit/result.py
@@ -157,7 +157,8 @@ class QFitResult(QtWidgets.QDialog, Ui_Dialog):
     def reset_fit_ranges(self):
         for i in range(self.sets_comboBox.count()):
             graph_id = self.sets_comboBox.itemData(i)
-            self.graph_opts.pop(graph_id)
+            if graph_id in self.graph_opts:
+                self.graph_opts.pop(graph_id)
 
         self.fit_plot.enableAutoRange()