diff --git a/nmreval/gui_qt/fit/fit_parameter.py b/nmreval/gui_qt/fit/fit_parameter.py
index 96ff18b..8bd125b 100644
--- a/nmreval/gui_qt/fit/fit_parameter.py
+++ b/nmreval/gui_qt/fit/fit_parameter.py
@@ -241,7 +241,7 @@ class QFitParameterWidget(QtWidgets.QWidget, Ui_FormFit):
 
                 else:
                     if p_i is None:
-                        kw_p[g.argname] = g.value
+                        kw_p.update(g.value)
                     else:
                         kw_p[g.argname] = p_i
 
diff --git a/nmreval/gui_qt/nmr/coupling_calc.py b/nmreval/gui_qt/nmr/coupling_calc.py
index b5bb877..2743efa 100644
--- a/nmreval/gui_qt/nmr/coupling_calc.py
+++ b/nmreval/gui_qt/nmr/coupling_calc.py
@@ -59,8 +59,12 @@ class QCoupCalcDialog(QtWidgets.QDialog, Ui_coupling_calc_dialog):
 
     def calc_coupling(self):
         p = []
+        kw = {}
         for pp in self._coupling_parameter:
-            p.append(pp.value)
+            if isinstance(pp, FormWidget):
+                p.append(pp.value)
+            else:
+                kw.update(pp.value)
 
         self.label.setText('Coupling constant: %.8g' % self.cp[self.comboBox.currentIndex()].relax(*p))