Bash - if condition command not found

I would like to execute a quite simple test by using :

YY=${array[17]}
echo $YY

if [ "$YY" -ne 0 ]
then
    echo "do.."
else
    echo "here"
fi

But this code returns :

0
./script.sh: line 303: $'[\302\2400': command not found

What I do wrong ?