--- a/src/eric7/Tasks/TaskViewer.py	Wed Nov 16 10:10:06 2022 +0100
+++ b/src/eric7/Tasks/TaskViewer.py	Wed Nov 16 10:53:40 2022 +0100
@@ -795,7 +795,7 @@
             taskType: Preferences.getTasks(markersName).split()
             for taskType, markersName in Task.TaskType2MarkersName.items()
         }
-        files = self.project.pdata["SOURCES"]
+        files = self.project.getProjectData(dataKey="SOURCES")
 
         # apply file filter
         filterList = [