diff --git a/vlib/builtin/array.v b/vlib/builtin/array.v
index 454d062319..faecdf56b1 100644
--- a/vlib/builtin/array.v
+++ b/vlib/builtin/array.v
@@ -636,6 +636,9 @@ fn (mut a array) push(val voidptr) {
 // `val` is array.data and user facing usage is `a << [1,2,3]`
 [unsafe]
 pub fn (mut a3 array) push_many(val voidptr, size int) {
+	if size <= 0 || isnil(val) {
+		return
+	}
 	a3.ensure_cap(a3.len + size)
 	if a3.data == val && a3.data != 0 {
 		// handle `arr << arr`
diff --git a/vlib/builtin/array_d_gcboehm_opt.v b/vlib/builtin/array_d_gcboehm_opt.v
index b90c008788..b94231943f 100644
--- a/vlib/builtin/array_d_gcboehm_opt.v
+++ b/vlib/builtin/array_d_gcboehm_opt.v
@@ -227,6 +227,9 @@ fn (mut a array) push_noscan(val voidptr) {
 // `val` is array.data and user facing usage is `a << [1,2,3]`
 [unsafe]
 fn (mut a3 array) push_many_noscan(val voidptr, size int) {
+	if size <= 0 || isnil(val) {
+		return
+	}
 	if a3.data == val && a3.data != 0 {
 		// handle `arr << arr`
 		copy := a3.clone()