Cherry-pick !1788 in v30r6-patches
Corrected a rare instance of segmentation fault due to chi2 being rigourously 0
See merge request !1788 (merged)
(cherry picked from commit 5d6af5e9)
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Corrected a rare instance of segmentation fault due to chi2 being rigourously 0
See merge request !1788 (merged)
(cherry picked from commit 5d6af5e9)