diff --git a/core/src/trezor/wire/thp/session_context.py b/core/src/trezor/wire/thp/session_context.py
index d694269002..f266e7482e 100644
--- a/core/src/trezor/wire/thp/session_context.py
+++ b/core/src/trezor/wire/thp/session_context.py
@@ -1,6 +1,7 @@
 from typing import TYPE_CHECKING
 
 from storage import cache_thp
+from storage.cache_common import InvalidSessionError
 from storage.cache_thp import SessionThpCache
 from trezor import log, loop, protobuf, utils
 from trezor.wire import message_handler, protocol_common
@@ -133,6 +134,10 @@ class SeedlessSessionContext(GenericSessionContext):
     def get_session_state(self) -> SessionState:
         return SessionState.SEEDLESS
 
+    @property
+    def cache(self) -> DataCache:
+        raise InvalidSessionError
+
 
 class SessionContext(GenericSessionContext):