diff --git a/lib/galaxy/authnz/psa_authnz.py b/lib/galaxy/authnz/psa_authnz.py
index 876c67d65b16..9fbeaf95c0b2 100644
--- a/lib/galaxy/authnz/psa_authnz.py
+++ b/lib/galaxy/authnz/psa_authnz.py
@@ -238,7 +238,7 @@ def is_integrity_error(cls, exception):
 def on_the_fly_config(trans):
     trans.app.model.PSACode.sa_session = trans.sa_session
     trans.app.model.UserAuthnzToken.trans = trans
-    trans.app.model.PSANonce.trans = trans
+    trans.app.model.PSANonce.sa_session = trans.sa_session
     trans.app.model.PSAPartial.trans = trans
     trans.app.model.PSAAssociation.sa_session = trans.sa_session
 
diff --git a/lib/galaxy/model/__init__.py b/lib/galaxy/model/__init__.py
index 204268fc217a..55f35eb6a7b4 100644
--- a/lib/galaxy/model/__init__.py
+++ b/lib/galaxy/model/__init__.py
@@ -4811,9 +4811,8 @@ def get_code(cls, code):
 
 class PSANonce(NonceMixin):
 
-    # This static property is of type: galaxy.web.framework.webapp.GalaxyWebTransaction
-    # and it is set in: galaxy.authnz.psa_authnz.PSAAuthnz
-    trans = None
+    # This static property is set at: galaxy.authnz.psa_authnz.PSAAuthnz
+    sa_session = None
 
     def __init__(self, server_url, timestamp, salt):
         self.server_url = server_url
@@ -4821,17 +4820,17 @@ def __init__(self, server_url, timestamp, salt):
         self.salt = salt
 
     def save(self):
-        self.trans.sa_session.add(self)
-        self.trans.sa_session.flush()
+        self.sa_session.add(self)
+        self.sa_session.flush()
 
     @classmethod
     def use(cls, server_url, timestamp, salt):
         try:
-            return cls.trans.sa_session.query(cls).filter_by(server_url=server_url, timestamp=timestamp, salt=salt)[0]
+            return cls.sa_session.query(cls).filter_by(server_url=server_url, timestamp=timestamp, salt=salt)[0]
         except IndexError:
             instance = cls(server_url=server_url, timestamp=timestamp, salt=salt)
-            cls.trans.sa_session.add(instance)
-            cls.trans.sa_session.flush()
+            cls.sa_session.add(instance)
+            cls.sa_session.flush()
             return instance