diff --git a/chipsec/utilcmd/txt_cmd.py b/chipsec/utilcmd/txt_cmd.py
index 79c566ca69..2ef3dcef0b 100644
--- a/chipsec/utilcmd/txt_cmd.py
+++ b/chipsec/utilcmd/txt_cmd.py
@@ -63,6 +63,8 @@ def txt_dump(self):
 
     def _log_register(self, reg_name):
         """Log the content of a register with lines starting with [CHIPSEC]"""
+        if not self.cs.register.is_defined(reg_name):
+            return
         reg_def = self.cs.register.get_def(reg_name)
         value = self.cs.register.read(reg_name)
         desc = reg_def["desc"]