# Buggy code
def process_signatures(self, params):
    """Handle signature response."""
    try:
        signature_params = params["params"]

        if signature_params is not None and "activeParameter" in signature_params:
            self.sig_signature_invoked.emit(signature_params)
            signature_data = signature_params["signatures"]
            documentation = signature_data["documentation"]

            # The language server returns encoded text with
            # spaces defined as `\xa0`
            documentation = documentation.replace("\xa0", " ")

            parameter_idx = signature_params["activeParameter"]
            parameters = signature_data["parameters"]
            parameter = None
            if len(parameters) > 0 and parameter_idx < len(parameters):
                parameter_data = parameters[parameter_idx]
                parameter = parameter_data["label"]

            signature = signature_data["label"]

            # This method is part of spyder/widgets/mixins
            self.show_calltip(
                signature=signature,
                parameter=parameter,
                language=self.language,
                documentation=documentation,
            )
    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 signature")


# 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 process_signatures(self, params):
    """Handle signature response."""
    try:
        signature_params = params["params"]

        if signature_params is not None and "activeParameter" in signature_params:
            self.sig_signature_invoked.emit(signature_params)
            signature_data = signature_params["signatures"]
            documentation = signature_data["documentation"]

            # The language server returns encoded text with
            # spaces defined as `\xa0`
            documentation = documentation.replace("\xa0", " ")

            parameter_idx = signature_params["activeParameter"]
            parameters = signature_data["parameters"]
            parameter = None
            if len(parameters) > 0 and parameter_idx < len(parameters):
                parameter_data = parameters[parameter_idx]
                parameter = parameter_data["label"]

            signature = signature_data["label"]

            # This method is part of spyder/widgets/mixins
            self.show_calltip(
                signature=signature,
                parameter=parameter,
                language=self.language,
                documentation=documentation,
            )
    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 signature")