diff --git a/python/src/trezorlib/_internal/emulator.py b/python/src/trezorlib/_internal/emulator.py
index 8ec49a8690..8772770b40 100644
--- a/python/src/trezorlib/_internal/emulator.py
+++ b/python/src/trezorlib/_internal/emulator.py
@@ -103,6 +103,8 @@ class Emulator:
         """
         if self._client is None:
             raise RuntimeError
+        if self._client.is_invalidated:
+            self._client = self._client.get_new_client()
         return self._client
 
     def make_args(self) -> List[str]:
@@ -122,7 +124,7 @@ class Emulator:
         start = time.monotonic()
         try:
             while True:
-                if transport._ping():
+                if transport.ping():
                     break
                 if self.process.poll() is not None:
                     raise RuntimeError("Emulator process died")