diff --git a/pykirdy/kirdy_qt.py b/pykirdy/kirdy_qt.py
index 4d97d5e..54588ff 100644
--- a/pykirdy/kirdy_qt.py
+++ b/pykirdy/kirdy_qt.py
@@ -209,7 +209,12 @@ class Graphs:
             ts = report['ts']
 
             self.ld_i_set_connector.cb_append_data_point(ld_i_set, ts)
-            self.pd_mon_pwr_connector.cb_append_data_point(pd_pwr, ts)
+            if pd_pwr is not None:
+                self._pd_mon_pwr_plot.show()
+                self.pd_mon_pwr_connector.cb_append_data_point(pd_pwr, ts)
+            else:
+                self._pd_mon_pwr_plot.hide()
+                self.pd_mon_pwr_connector.cb_append_data_point(0.0, ts)
 
             if tec_temp is not None:
                 self.tec_temp_connector.cb_append_data_point(tec_temp, ts)