Can't use an undefined value as a symbol reference at ./rdp_check.pl line 423

[ghost]

hi, when check some ips, script down with error:
Can't use an undefined value as a symbol reference at ./rdp_check.pl line 423

[+] Connecting to 192.168.1.139:3389
[+] Checking supported protocols
[-] Checking if RDP Security (PROTOCOL_RDP) is supported...[W] Timeout on recv. Results may be unreliable.
Not supported - unexpected response
[-] Checking if TLS Security (PROTOCOL_SSL) is supported...[W] Timeout on recv. Results may be unreliable.
Not supported - unexpected response
[-] Checking if CredSSP Security (PROTOCOL_HYBRID) is supported [uses NLA]...[W] Timeout on connect. Retrying...
Can't use an undefined value as a symbol reference at ./rdp_check.pl line 423