don't save invalid addreses

libi2pd_client/AddressBook.cpp

@@ -197,6 +197,8 @@ namespace client
 		}
 
 		for (const auto& it: addresses)
+		{
+			if (it.second->IsValid ())
 			{	
 				f << it.first << ",";
 				if (it.second->IsIdentHash ())
@@ -206,6 +208,9 @@ namespace client
 				f << std::endl;
 				num++;
 			}	
+			else
+				LogPrint (eLogWarning, "Addressbook: invalid address ", it.first);
+		}
 		LogPrint (eLogInfo, "Addressbook: ", num, " addresses saved");
 		return num;
 	}