diff --git a/src/gui_qt/fit/fitwindow.py b/src/gui_qt/fit/fitwindow.py
index ea66eef..55116b7 100644
--- a/src/gui_qt/fit/fitwindow.py
+++ b/src/gui_qt/fit/fitwindow.py
@@ -465,9 +465,9 @@ class QFitDialog(QtWidgets.QWidget, Ui_FitDialog):
         # which data uses which model
         data = self.data_table.collect_data(default=self.default_combobox.currentData())
 
-        glob_fit_parameter = []
-
         for fitted_model, fitted_data in data.items():
+            glob_fit_parameter = []
+
             for fit_id, fit_curve in parameter.items():
                 if fit_id in fitted_data:
                     fit_parameter = list(fit_curve.parameter.values())