I have for a while noticed that I am not able to properly see some death (somewhat randomly) because of an error and did some digging;

It is the SPELL_DISPEL_FAILED combat log event that causes errors to occur since the addon cannot parse the deaths with this event, since the type is missing.

I simply replaced it with the same type as SPELL_DISPEL; since the dispels are not actually shown anyway we just need it to not cause an error.

["SPELL_DISPEL"] = { TypeAura, nil, nil, ExtraSpellId, AuraDispel },
["SPELL_DISPEL_FAILED"] = { TypeAura, nil, nil, ExtraSpellId, AuraDispel },

Thanks for your contrubution!