diff --git a/src/edt/edt/edtPCellParametersPage.cc b/src/edt/edt/edtPCellParametersPage.cc
index 7df251096..bcd9ae8a2 100644
--- a/src/edt/edt/edtPCellParametersPage.cc
+++ b/src/edt/edt/edtPCellParametersPage.cc
@@ -713,9 +713,11 @@ PCellParametersPage::do_parameter_changed ()
   bool ok = true;
   db::ParameterStates states = m_states;
   get_parameters (states, &ok);   //  includes coerce
-  update_widgets_from_states (states);
-  if (ok && ! lazy_evaluation ()) {
-    emit edited ();
+  if (ok) {
+    update_widgets_from_states (states);
+    if (! lazy_evaluation ()) {
+      emit edited ();
+    }
   }
 }