FIX Bug in mark_xfail_checks
@@ -365,7 +365,7 @@ def _mark_xfail_checks(estimator, check, pytest):
# try to construct estimator instance, if it is unable to then
# return the estimator class, ignoring the tag
try:
- estimator = _construct_instance(estimator),
+ estimator = _construct_instance(estimator)
except Exception:
return estimator, check
