The last patch wasn't that good, fix

main/SAPI.c

@@ -378,15 +378,13 @@ SAPI_API int sapi_flush()
 	if (sapi_module.flush) {
 		SLS_FETCH();
 
-		if (SG(server_context)) {
-			sapi_module.flush(SG(server_context));
-			return SUCCESS;
-		}
+		sapi_module.flush(SG(server_context));
+		return SUCCESS;
+	} else {
+		return FAILURE;
 	}
-	return FAILURE;
 }
 
-
 SAPI_API struct stat *sapi_get_stat()
 {
 	SLS_FETCH();

sapi/apache/mod_php4.c

@@ -149,11 +149,13 @@ static int sapi_apache_ub_write(const char *str, uint str_length)
 
 static void sapi_apache_flush(void *server_context)
 {
+	if (server_context) {
 #if MODULE_MAGIC_NUMBER > 19970110
-	rflush((request_rec *) server_context);
+		rflush((request_rec *) server_context);
 #else
-	bflush((request_rec *) server_context->connection->client);
+		bflush((request_rec *) server_context->connection->client);
 #endif
+	}
 }