IRULE: APP CRASH AFTER HTTP_RESPONSE WHEN DISPLAY VARIABLE

when RULE_INIT {

set static::conn_debug 0

}

when HTTP_REQUEST {

set login_request 0
    set usuario "NO"

    log local0. "Enter HTTP_REQUEST [HTTP::path]"

if { [HTTP::path] starts_with "/app" && [HTTP::method] eq "POST" } {


    HTTP::header remove "Accept-Encoding"

    if { [HTTP::version] eq "1.1" } {
        if { [HTTP::header is_keepalive] } { 
                          HTTP::header replace "Connection" "Keep-Alive" 
                    }
        HTTP::version "1.0"
    }


    if { [HTTP::header exists "Content-Length"] && [HTTP::header "Content-Length"] < 1048577 } {
        set content_length [HTTP::header "Content-Length"]
    } else {
        set content_length 1048576
    }
    if { $content_length > 0 } {
        HTTP::collect $content_length
    }

    set login_request 1
}

}

when HTTP_REQUEST_DATA {

     log local0. "Enter HTTP_REQUEST_DATA [$login_request]"
 if { $login_request == 1 } {

      if { [URI::query "?[HTTP::payload]" exe] equals "exe" } {

        set usuario [URI::query "?[HTTP::payload]" userne]

        if { $::usuario != "" } {
                     if { [string tolower $usuario] equals "validuser" } {
               log local0. "allow"            
         } elseif {[string tolower $usuario] starts_with "a"  }{
               TCP::close
               log local0. "Block"
         } else {
               set login_request 0
                     }
            }

        HTTP::release
     }
 }
     log local0. "Exit HTTP_REQUEST_DATA"

}

when HTTP_RESPONSE {

 log local0. " here is the crash $usuario"

}