diff --git a/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp b/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp
index 3df2fb60ed..00527167da 100644
--- a/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp
+++ b/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp
@@ -477,6 +477,10 @@ void ViewProviderFemPostObject::WritePointData(vtkPoints* points, vtkDataArray*
 void ViewProviderFemPostObject::setRangeOfColorBar(double min, double max)
 {
     try {
+        if (min >= max) {
+            min = max - 10 * std::numeric_limits<float>::epsilon();
+            max = max + 10 * std::numeric_limits<float>::epsilon();
+        }
         m_colorBar->setRange(min, max);
     }
     catch (const Base::ValueError& e) {