diff --git a/SoObjects/Appointments/SOGoAppointmentFolder.m b/SoObjects/Appointments/SOGoAppointmentFolder.m
index 2c2b4dbd5..a4e7c03fd 100644
--- a/SoObjects/Appointments/SOGoAppointmentFolder.m
+++ b/SoObjects/Appointments/SOGoAppointmentFolder.m
@@ -1128,6 +1128,11 @@ firstInstanceCalendarDateRange: (NGCalendarDateRange *) fir
 	  currentValue++;
 	}
     }
+  else
+    {
+      /* We mark all values as nil since the area was not cleared before. */
+      memset (values, 0, propertiesCount * sizeof (NSString *));
+    }
 
 //    NSLog (@"/_properties:ofObject:: %@", [NSDate date]);