diff --git a/g3w-admin/qplotly/vendor/DataPlotly/core/plot_settings.py b/g3w-admin/qplotly/vendor/DataPlotly/core/plot_settings.py
index 0b047be2d..b13096129 100644
--- a/g3w-admin/qplotly/vendor/DataPlotly/core/plot_settings.py
+++ b/g3w-admin/qplotly/vendor/DataPlotly/core/plot_settings.py
@@ -207,6 +207,10 @@ def read_xml(self, element: QDomElement) -> bool:
         self.source_layer_id = res.get('source_layer_id', None)
         self.data_defined_properties.loadVariant(res.get('dynamic_properties', None), PlotSettings.DYNAMIC_PROPERTIES)
 
+        # With QGIS > 3.28 the QgsXmlutils.readVariant method has a new behavior for Qstring type parameters
+        if self.layout['title'] == None:
+            self.layout['title'] = ''
+
         return True
 
     def write_to_project(self, document: QDomDocument):