diff --git a/src/xpdev/netwrap.c b/src/xpdev/netwrap.c
index ff04c6f3043b4968753ac455c61c5d7045bc01d7..1e158b9bf5f2c670ea12d89db97870c8b92c92f7 100644
--- a/src/xpdev/netwrap.c
+++ b/src/xpdev/netwrap.c
@@ -106,6 +106,8 @@ const char* getHostNameByAddr(const char* str)
 	WSADATA wsaData;
 	WSAStartup(MAKEWORD(2, 2), &wsaData);
 #endif
+	if(str==NULL)
+		return NULL;
 	if((ip=inet_addr(str)) == INADDR_NONE)
 		return str;
 	if((h=gethostbyaddr((char *)&ip,sizeof(ip),AF_INET))==NULL)