Runtime error (func=(main), adr=9): Divide by zero

Question

I am getting below error. The script curl the provided url and compare it with the previous curl. Several tests can be made, the default one is calculating how many percentage of code have been changed since last check

error

Runtime error (func=(main), adr=9): Divide by zero ./check_defacement.sh: line 145: [: -ge: unary operator expected ./check_defacement.sh: line 151: [: -ge: unary operator expected

code

if [ "$int_per" -ge "$int_critical" ]; then 
    OUTPUT="CRITICAL - $int_per% code changed since last check | $int_per%" 
    STATE=$STATE_CRITICAL 
    cp $dump_dir/check_defacement_"$url" $dump_dir/dump_CRITICAL_date +"%d%m%Y%H%M%S"_"$url" 
fi 
if [ "$int_per" -ge "$int_warning" ]; then 
    OUTPUT="WARNING - $int_per% code changed since last check | $int_per%" 
    STATE=$STATE_WARNING 
    cp $dump_dir/check_defacement_"$url" $dump_dir/dump_WARNING_date +"%d%m%Y%H%M%S"_"$url" 
else 
    OUTPUT="OK - $int_per% code changed since last check | $int_per%" 
    STATE=$STATE_OK 
fi