--- a/eric6/Debugger/DebugViewer.py	Wed Dec 30 18:24:42 2020 +0100
+++ b/eric6/Debugger/DebugViewer.py	Thu Dec 31 17:42:50 2020 +0100
@@ -702,7 +702,10 @@
                 # nothing to do
                 return
             
-            currentParent = currentItem.parent()
+            if currentItem:
+                currentParent = currentItem.parent()
+            else:
+                currentParent = None
             if currentParent is None:
                 # current is a debugger item
                 self.__debuggersList.setCurrentItem(debuggerItem)