diff --git a/src/plugins/tool/TestcaseGenerator.py b/src/plugins/tool/TestcaseGenerator.py
index 74c253a65..acedc1e2b 100644
--- a/src/plugins/tool/TestcaseGenerator.py
+++ b/src/plugins/tool/TestcaseGenerator.py
@@ -66,6 +66,7 @@ class TestcaseGenerator(tool.BatchTool):
     LONG = 7
 
     def __init__(self, dbstate, uistate, options_class, name, callback=None):
+        self.person = None
         if dbstate.db.readonly:
             return