diff -urN apache_1.3.41/src/support/logresolve.c src/support/logresolve.c
--- apache_1.3.41/src/support/logresolve.c	2006-07-12 10:16:05.000000000 +0200
+++ src/support/logresolve.c	2008-10-06 16:29:12.000000000 +0200
@@ -165,7 +165,7 @@
 
 	hostdata = gethostbyaddr((const char *) &ipnum, sizeof(struct in_addr),
 				 AF_INET);
-	if (hostdata == NULL) {
+	if (hostdata == NULL || !hostdata->h_name || !*hostdata->h_name) {
 	    if (h_errno > MAX_ERR)
 		errors[UNKNOWN_ERR]++;
 	    else