Fix <=> for IPv4 and IPv6.

2 files changed, 2 insertions, 0 deletions

diff --git a/lib/ipaddress/ipv4.rb b/lib/ipaddress/ipv4.rb
index 7d8e0d3..5e456f6 100644
--- a/lib/ipaddress/ipv4.rb
+++ b/lib/ipaddress/ipv4.rb
@@ -509,6 +509,7 @@ module IPAddress;
     #     #=> ["10.100.100.1/8","10.100.100.1/16","172.16.0.1/16"]
     #
     def <=>(oth)
+      return nil unless oth.is_a?(self.class)
       return prefix <=> oth.prefix if to_u32 == oth.to_u32  
       to_u32 <=> oth.to_u32
     end
diff --git a/lib/ipaddress/ipv6.rb b/lib/ipaddress/ipv6.rb
index 88098bc..e6e8d04 100644
--- a/lib/ipaddress/ipv6.rb
+++ b/lib/ipaddress/ipv6.rb
@@ -487,6 +487,7 @@ module IPAddress;
     #     #=> ["2001:db8:1::1/64","2001:db8:1::1/65","2001:db8:2::1/64"]
     #
     def <=>(oth)
+      return nil unless oth.is_a?(self.class)
       return prefix <=> oth.prefix if to_u128 == oth.to_u128  
       to_u128 <=> oth.to_u128
     end