[Bug]: AttributeError: 'WebError' object has no attribute '_dispatcher_fiber'

[tgz-cz]

Version

1.49.1

Steps to reproduce

My test-bug.py script:

from playwright.sync_api import sync_playwright

def run(playwright):
    browser = playwright.chromium.launch()
    context = browser.new_context()
    context.on("weberror", lambda error: Exception(f"My page error: {error=}"))

    page = context.new_page()

    page.set_content("""
        <script>var x=null;</script>
        <div><button onclick="x.myattr('xxx')">Click me</button></div>
    """)
    page.get_by_role("button").click()

with sync_playwright() as playwright:
    run(playwright)

Expected behavior

The callback:

  lambda error: Exception(f"My page error: {error=}")

should be called with the "javascript error from the page"

Actual behavior

The following exception is raised:

  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/playwright/_impl/_connection.py", line 453, in dispatch
    g.switch(self._replace_guids_with_channels(params))
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/playwright/_impl/_connection.py", line 444, in _listener_with_error_handler_attached
    potential_future = listener(params)
                       ^^^^^^^^^^^^^^^^
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/playwright/_impl/_browser_context.py", line 170, in <lambda>
    lambda params: self._on_page_error(
                   ^^^^^^^^^^^^^^^^^^^^
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/playwright/_impl/_browser_context.py", line 695, in _on_page_error
    self.emit(BrowserContext.Events.WebError, WebError(self._loop, page, error))
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/pyee/base.py", line 212, in emit
    handled = self._call_handlers(event, args, kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/pyee/base.py", line 188, in _call_handlers
    self._emit_run(f, args, kwargs)
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/pyee/asyncio.py", line 53, in _emit_run
    self.emit("error", exc)
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/pyee/base.py", line 215, in emit
    self._emit_handle_potential_error(event, args[0] if args else None)
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/pyee/base.py", line 173, in _emit_handle_potential_error
    raise error
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/pyee/asyncio.py", line 51, in _emit_run
    coro: Any = f(*args, **kwargs)
                ^^^^^^^^^^^^^^^^^^
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/playwright/_impl/_impl_to_api_mapping.py", line 124, in wrapper_func
    *list(map(lambda a: self.from_maybe_impl(a), args))[:arg_count]
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/playwright/_impl/_impl_to_api_mapping.py", line 124, in <lambda>
    *list(map(lambda a: self.from_maybe_impl(a), args))[:arg_count]
                        ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/playwright/_impl/_impl_to_api_mapping.py", line 69, in from_maybe_impl
    api_instance = api_class(obj)
                   ^^^^^^^^^^^^^^
  File "/home/developer/.cache/pypoetry/virtualenvs/testbug-i1-BfjSz-py3.11/lib/python3.11/site-packages/playwright/_impl/_sync_base.py", line 92, in __init__
    self._dispatcher_fiber = impl_obj._dispatcher_fiber
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'WebError' object has no attribute '_dispatcher_fiber'

Additional context

Environment

- Operating System: Linux / docker image debian:bullseye-slim
- CPU: AMD Ryzen
- Browser: Chromium
- Python Version: 3.11.11