attempt to fix InvalidState

vsmetansky · vsmetansky · commit f13d866d53d4 · 2020-10-26T23:09:52.000+02:00
diff --git a/playwright/connection.py b/playwright/connection.py
@@ -177,7 +177,8 @@ def _dispatch(self, msg: ParsedMessagePayload) -> None:
             if error:
                 parsed_error = parse_error(error["error"])  # type: ignore
                 parsed_error.stack = callback.stack_trace
-                callback.future.set_exception(parsed_error)
+                if not callback.future.done():
+                    callback.future.cancel()
             else:
                 result = self._replace_guids_with_channels(msg.get("result"))
                 callback.future.set_result(result)
