diff --git a/src/pattern.c b/src/pattern.c
index 6c263bebe..ce0f07b40 100644
--- a/src/pattern.c
+++ b/src/pattern.c
@@ -491,7 +491,7 @@ struct pattern *pat_match_str(struct sample *smp, struct pattern_expr *expr, int
 	}
 
 	/* look in the list */
-	if (pat_lru_tree) {
+	if (pat_lru_tree && !LIST_ISEMPTY(&expr->patterns)) {
 		unsigned long long seed = pat_lru_seed ^ (long)expr;
 
 		lru = lru64_get(XXH3(smp->data.u.str.area, smp->data.u.str.data, seed),
@@ -534,7 +534,7 @@ struct pattern *pat_match_bin(struct sample *smp, struct pattern_expr *expr, int
 	struct pattern *ret = NULL;
 	struct lru64 *lru = NULL;
 
-	if (pat_lru_tree) {
+	if (pat_lru_tree && !LIST_ISEMPTY(&expr->patterns)) {
 		unsigned long long seed = pat_lru_seed ^ (long)expr;
 
 		lru = lru64_get(XXH3(smp->data.u.str.area, smp->data.u.str.data, seed),
@@ -603,7 +603,7 @@ struct pattern *pat_match_reg(struct sample *smp, struct pattern_expr *expr, int
 	struct pattern *ret = NULL;
 	struct lru64 *lru = NULL;
 
-	if (pat_lru_tree) {
+	if (pat_lru_tree && !LIST_ISEMPTY(&expr->patterns)) {
 		unsigned long long seed = pat_lru_seed ^ (long)expr;
 
 		lru = lru64_get(XXH3(smp->data.u.str.area, smp->data.u.str.data, seed),
@@ -686,7 +686,7 @@ struct pattern *pat_match_beg(struct sample *smp, struct pattern_expr *expr, int
 	}
 
 	/* look in the list */
-	if (pat_lru_tree) {
+	if (pat_lru_tree && !LIST_ISEMPTY(&expr->patterns)) {
 		unsigned long long seed = pat_lru_seed ^ (long)expr;
 
 		lru = lru64_get(XXH3(smp->data.u.str.area, smp->data.u.str.data, seed),
@@ -730,7 +730,7 @@ struct pattern *pat_match_end(struct sample *smp, struct pattern_expr *expr, int
 	struct pattern *ret = NULL;
 	struct lru64 *lru = NULL;
 
-	if (pat_lru_tree) {
+	if (pat_lru_tree && !LIST_ISEMPTY(&expr->patterns)) {
 		unsigned long long seed = pat_lru_seed ^ (long)expr;
 
 		lru = lru64_get(XXH3(smp->data.u.str.area, smp->data.u.str.data, seed),
@@ -778,7 +778,7 @@ struct pattern *pat_match_sub(struct sample *smp, struct pattern_expr *expr, int
 	struct pattern *ret = NULL;
 	struct lru64 *lru = NULL;
 
-	if (pat_lru_tree) {
+	if (pat_lru_tree && !LIST_ISEMPTY(&expr->patterns)) {
 		unsigned long long seed = pat_lru_seed ^ (long)expr;
 
 		lru = lru64_get(XXH3(smp->data.u.str.area, smp->data.u.str.data, seed),