More protection...

main/SAPI.c

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