diff --git a/volatility3/framework/plugins/linux/psscan.py b/volatility3/framework/plugins/linux/psscan.py
index f4bfd347e..ca9d30586 100644
--- a/volatility3/framework/plugins/linux/psscan.py
+++ b/volatility3/framework/plugins/linux/psscan.py
@@ -52,7 +52,10 @@ class PsScan(interfaces.plugins.PluginInterface):
         """
         pid = task.tgid
         tid = task.pid
-        ppid = task.parent.tgid if task.parent else 0
+        ppid = 0
+
+        if task.parent.is_readable():
+            ppid = task.parent.tgid
         name = utility.array_to_string(task.comm)
         exit_state = DescExitStateEnum(task.exit_state).name