Index: uspace/app/top/top.c
===================================================================
--- uspace/app/top/top.c	(revision 7a3ccbc6e1c0aa8975d8336895a58f02c44c4808)
+++ uspace/app/top/top.c	(revision a325832e40265e1eb176995bec5cf79d579eb46c)
@@ -111,7 +111,7 @@
 
 	/* For all tasks compute sum and differencies of all cycles */
-	uint64_t mem_total = 0;
-	uint64_t ucycles_total = 0;
-	uint64_t kcycles_total = 0;
+	uint64_t mem_total = 1; /*< Must NOT be null! */
+	uint64_t ucycles_total = 1; /*< Must NOT be null! */
+	uint64_t kcycles_total = 1; /*< Must NOT be null! */
 	uint64_t *ucycles_diff = malloc(new_data->task_count * sizeof(uint64_t));
 	uint64_t *kcycles_diff = malloc(new_data->task_count * sizeof(uint64_t));