Error while processing summary: 'int' object has no attribute 'to_btc_str'

[overcoin]

Issue and Steps to Reproduce

lightning-cli summary

{
   "code": -32600,
   "message": "Error while processing summary: 'int' object has no attribute 'to_btc_str'",
   "traceback": "Traceback (most recent call last):\n  File \"/home/XXX/.local/lib/python3.9/site-packages/pyln/client/plugin.py\", line 627, in _dispatch_request\n    result = self._exec_func(method.func, request)\n  File \"/home/XXX/.local/lib/python3.9/site-packages/pyln/client/plugin.py\", line 609, in _exec_func\n    return func(*ba.args, **ba.kwargs)\n  File \"/home/XXX/plugins/summary/summary.py\", line 169, in summary\n    reply['fees_collected'] = info['fees_collected_msat'].to_btc_str()\nAttributeError: 'int' object has no attribute 'to_btc_str'\n"
}

getinfo output

"version": "v0.12.0"