Mysql case returning type blob

Question

I created a search query in Mysql and using case within it. The problem is that by returning the value of the column that is of the whole type, the value comes with the answer blob.

Follow SELECT with image of the query result below:

select 
max(b.sequencia),
case 
    when b.sequencia is null then '0'
    else max(b.sequencia)
end as Max 
from
    cad_tramitacao b 
where
    b.ficha = '187080' and b.arquivo = 'M' and b.incidente = "0";

Answer 1

Following the @Viirgilio Novic tip, I just removed the quotes from '0' and it worked perfectly.