NullPointerException when using conditional command within a function

When I put this in the function "test:t2" in a datapack

say hi
execute if entity @e[type=player] run say helloplayer
execute unless entity @e[type=blaze] run say hellonoblaze
execute if entity @e[type=blaze] run say helloblaze
say bye

and run

function test:t2

it outputs "hi" in the chat and then java.lang.NullPointerException.

Executing the individual commands has mostly expected behavior.... except the 'unless' one says 'no entity found' when it should chat 'hellonoblaze'.