mycli output (0, '') when the last query is cancelled

[cosven]

I run a query show backends and it run for several seconds, then I cancel the query using 'ctrl-c'.
I run some other query later, and mycli always output

(0, '')

mycli version: 8c005f7 ( I also met this problem in the latest release)

I checked mycli.log and found an exception

Traceback (most recent call last):
  File "/Users/cosven/code/mycli/mycli/sqlexecute.py", line 248, in run
    for result in special.execute(cur, sql):
                  ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/cosven/code/mycli/mycli/packages/special/main.py", line 58, in execute
    raise CommandNotFound
mycli.packages.special.main.CommandNotFound

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/cosven/code/mycli/mycli/main.py", line 727, in one_iteration
    for title, cur, headers, status in res:
  File "/Users/cosven/code/mycli/mycli/sqlexecute.py", line 252, in run
    cur.execute(sql)
  File "/opt/homebrew/lib/python3.11/site-packages/pymysql/cursors.py", line 153, in execute
    result = self._query(query)
             ^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/pymysql/cursors.py", line 322, in _query
    conn.query(q)
  File "/opt/homebrew/lib/python3.11/site-packages/pymysql/connections.py", line 557, in query
    self._execute_command(COMMAND.COM_QUERY, sql)
  File "/opt/homebrew/lib/python3.11/site-packages/pymysql/connections.py", line 840, in _execute_command
    raise err.InterfaceError(0, "")
pymysql.err.InterfaceError: (0, '')

mycli.log

2023-11-16 10:43:25,384 (27740/completion_refresh) mycli.sqlexecute ERROR - No user completions due to OperationalError(1105, "errCode = 2, detailMessage = Unknown table 'user'")
2023-11-16 10:43:25,582 (27740/completion_refresh) mycli.sqlexecute ERROR - No show completions due to OperationalError(1105, "errCode = 2, detailMessage = Unknown table 'help_topic'")
2023-11-16 15:48:40,769 (50597/completion_refresh) mycli.sqlexecute ERROR - No user completions due to OperationalError(1105, "errCode = 2, detailMessage = Unknown table 'user'")
2023-11-16 15:48:40,956 (50597/completion_refresh) mycli.sqlexecute ERROR - No show completions due to OperationalError(1105, "errCode = 2, detailMessage = Unknown table 'help_topic'")
2023-11-16 15:48:45,183 (50597/completion_refresh) mycli.sqlexecute ERROR - No user completions due to OperationalError(1105, "errCode = 2, detailMessage = Unknown table 'user'")
2023-11-16 15:48:45,400 (50597/completion_refresh) mycli.sqlexecute ERROR - No show completions due to OperationalError(1105, "errCode = 2, detailMessage = Unknown table 'help_topic'")
2023-11-16 16:26:01,638 (50597/MainThread) mycli.main ERROR - sql: 'show backends;', error: InterfaceError(0, '')
2023-11-16 16:26:01,640 (50597/MainThread) mycli.main ERROR - traceback: 'Traceback (most recent call last):\n  File "/Users/cosven/code/mycli/mycli/sqlexecute.py", line 248, in run\n    for result in special.execute(cur, sql):\n                  ^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/Users/cosven/code/mycli/mycli/packages/special/main.py", line 58, in execute\n    raise CommandNotFound\nmycli.packages.special.main.CommandNotFound\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File "/Users/cosven/code/mycli/mycli/main.py", line 727, in one_iteration\n    for title, cur, headers, status in res:\n  File "/Users/cosven/code/mycli/mycli/sqlexecute.py", line 252, in run\n    cur.execute(sql)\n  File "/opt/homebrew/lib/python3.11/site-packages/pymysql/cursors.py", line 153, in execute\n    result = self._query(query)\n             ^^^^^^^^^^^^^^^^^^\n  File "/opt/homebrew/lib/python3.11/site-packages/pymysql/cursors.py", line 322, in _query\n    conn.query(q)\n  File "/opt/homebrew/lib/python3.11/site-packages/pymysql/connections.py", line 557, in query\n    self._execute_command(COMMAND.COM_QUERY, sql)\n  File "/opt/homebrew/lib/python3.11/site-packages/pymysql/connections.py", line 840, in _execute_command\n    raise err.InterfaceError(0, "")\npymysql.err.InterfaceError: (0, \'\')\n'