[v13] error when adding % diff Act vs Budget

[fclementic2c]

When I try to add a column Diff in % I get an error :
see video
https://drive.google.com/open?id=1KW61djDL6VXk1QBDoz8NUECrSYAOE0of

error:
Error:
Odoo Server Error

Traceback (most recent call last):
File "/odoo/src/odoo/http.py", line 624, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/odoo/src/odoo/http.py", line 310, in _handle_exception
raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
File "/odoo/src/odoo/tools/pycompat.py", line 14, in reraise
raise value
File "/odoo/src/odoo/http.py", line 669, in dispatch
result = self._call_function(**self.params)
File "/odoo/src/odoo/http.py", line 350, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/odoo/src/odoo/service/model.py", line 94, in wrapper
return f(dbname, *args, **kwargs)
File "/odoo/src/odoo/http.py", line 339, in checked_call
result = self.endpoint(*a, **kw)
File "/odoo/src/odoo/http.py", line 915, in call
return self.method(*args, **kw)
File "/odoo/src/odoo/http.py", line 515, in response_wrap
response = f(*args, **kw)
File "/odoo/src/addons/web/controllers/main.py", line 1322, in call_kw
return self._call_kw(model, method, args, kwargs)
File "/odoo/src/addons/web/controllers/main.py", line 1314, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/odoo/src/odoo/api.py", line 387, in call_kw
result = _call_kw_multi(method, model, args, kwargs)
File "/odoo/src/odoo/api.py", line 374, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/odoo/external-src/mis-builder/mis_builder/models/mis_report_instance.py", line 806, in compute
kpi_matrix = self._compute_matrix()
File "/odoo/external-src/mis-builder/mis_builder/models/mis_report_instance.py", line 800, in _compute_matrix
kpi_matrix.compute_comparisons()
File "/odoo/external-src/mis-builder/mis_builder/models/kpimatrix.py", line 314, in compute_comparisons
common_subkpis = self._common_subkpis([col, base_col])
File "/odoo/external-src/mis-builder/mis_builder/models/kpimatrix.py", line 298, in _common_subkpis
common_subkpis = set(cols[0].subkpis)
AttributeError: 'NoneType' object has no attribute 'subkpis'

[miquelalzanillas]

Same here. When trying to compare two columns in v11. Is this a bug?

[github-actions]

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