Removing placed blocks on death

[Svennez]

on place:
    add location of event-block to {placed-blocks.%{blocks.%player%}%::*}
    set {block::%{blocks.%player%}%::%location of event-block%} to true
  
command /clear:
    trigger:
        loop {placed-blocks.%{blocks.%player%}%::*}:
            set location of loop-value to air

Error:
the location of loop-value can't be set to anything

How to solve this?

 

[Donut]

set block at loop-value to air