diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index 1aac0d9..e9dbc9c 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -1022,12 +1022,16 @@
 				 * applies.
 				 */
 				struct stktable_key *key;
+				struct sample smp;
 
 				if (stkctr_entry(&s->stkctr[tcp_trk_idx(rule->action)]))
 					continue;
 
 				t = rule->act_prm.trk_ctr.table.t;
-				key = stktable_fetch_key(t, s->be, s, &s->txn, SMP_OPT_DIR_REQ|SMP_OPT_FINAL, rule->act_prm.trk_ctr.expr, NULL);
+				key = stktable_fetch_key(t, s->be, s, &s->txn, SMP_OPT_DIR_REQ | partial, rule->act_prm.trk_ctr.expr, &smp);
+
+				if (smp.flags & SMP_F_MAY_CHANGE)
+					goto missing_data;
 
 				if (key && (ts = stktable_get_entry(t, key))) {
 					session_track_stkctr(&s->stkctr[tcp_trk_idx(rule->action)], t, ts);