diff --git a/tests/test_cli.py b/tests/test_cli.py
index 1e14e51..6945c2b 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -486,7 +486,7 @@ session_name: hello
                 '{SESSION_NAME}',
                 '{WINDOW_NAME}',
                 '-c',
-                'print(pane.id)',
+                'print(getattr(pane, "id", "{PANE_ID}"))',
             ],
             [],
             {},
@@ -496,7 +496,7 @@ session_name: hello
             [
                 '-L{SOCKET_NAME}',
                 '-c',
-                'print(pane.id)',
+                'print(getattr(pane, "id", "{PANE_ID}"))',
             ],
             [],
             {'TMUX_PANE': '{PANE_ID}'},