# Buggy code
def handle_hover_response(self, contents):
    """Handle hover response."""
    if running_under_pytest():
        try:
            from unittest.mock import Mock
        except ImportError:
            from mock import Mock  # Python 2

        # On some tests this is returning a Mock
        if isinstance(contents, Mock):
            return

    try:
        content = contents["params"]

        if running_under_pytest():
            # On some tests this is returning a list
            if isinstance(content, list):
                return

        self.sig_display_object_info.emit(content, self._request_hover_clicked)
        if content is not None and self._show_hint and self._last_point:
            # This is located in spyder/widgets/mixins.py
            word = self._last_hover_word
            content = content.replace("\xa0", " ")
            self.show_hint(content, inspect_word=word, at_point=self._last_point)
            self._last_point = None
    except RuntimeError:
        # This is triggered when a codeeditor instance has been
        # removed before the response can be processed.
        return
    except Exception:
        self.log_lsp_handle_errors("Error when processing hover")


# Traceback (KeyError)
File "/home/carlos/Projects/spyder/github-repo/spyder/plugins/completion/plugin.py", line 120, in receive_response

Traceback (most recent call last):
File "/home/carlos/Projects/spyder/github-repo/spyder/plugins/completion/plugin.py", line 120, in receive_response
self._maybe_send_locked(req_id)
File "/home/carlos/Projects/spyder/github-repo/spyder/plugins/completion/plugin.py", line 161, in _maybe_send_locked
send()
File "/home/carlos/Projects/spyder/github-repo/spyder/plugins/completion/plugin.py", line 143, in send
self.gather_and_send(request_responses)
File "/home/carlos/Projects/spyder/github-repo/spyder/plugins/completion/plugin.py", line 212, in gather_and_send
response_instance.handle_response(req_type, responses)
File "/home/carlos/Projects/spyder/github-repo/spyder/plugins/editor/widgets/codeeditor.py", line 928, in handle_response
handler(params)
File "/home/carlos/Projects/spyder/github-repo/spyder/plugins/editor/widgets/codeeditor.py", line 1325, in handle_folding_range
folding_panel.update_folding(ranges)
File "/home/carlos/Projects/spyder/github-repo/spyder/plugins/editor/panels/codefolding.py", line 220, in update_folding
folding_status[new_line] = self.folding_status[line]
KeyError: 297

# Fixed code
def handle_hover_response(self, contents):
    """Handle hover response."""
    if running_under_pytest():
        try:
            from unittest.mock import Mock
        except ImportError:
            from mock import Mock  # Python 2

        # On some tests this is returning a Mock
        if isinstance(contents, Mock):
            return

    try:
        content = contents["params"]

        if running_under_pytest():
            # On some tests this is returning a list
            if isinstance(content, list):
                return

        self.sig_display_object_info.emit(content, self._request_hover_clicked)
        if content is not None and self._show_hint and self._last_point:
            # This is located in spyder/widgets/mixins.py
            word = self._last_hover_word
            content = content.replace("\xa0", " ")
            self.show_hint(content, inspect_word=word, at_point=self._last_point)
            self._last_point = None
    except RuntimeError:
        # This is triggered when a codeeditor instance was removed
        # before the response can be processed.
        return
    except Exception:
        self.log_lsp_handle_errors("Error when processing hover")