diff --git a/tpl/template_funcs.go b/tpl/template_funcs.go
index b92c2c955..f704f0a4f 100644
--- a/tpl/template_funcs.go
+++ b/tpl/template_funcs.go
@@ -330,6 +330,10 @@ func In(l interface{}, v interface{}) bool {
 	case reflect.Array, reflect.Slice:
 		for i := 0; i < lv.Len(); i++ {
 			lvv := lv.Index(i)
+			lvv, isNil := indirect(lvv)
+			if isNil {
+				continue
+			}
 			switch lvv.Kind() {
 			case reflect.String:
 				if vv.Type() == lvv.Type() && vv.String() == lvv.String() {
diff --git a/tpl/template_funcs_test.go b/tpl/template_funcs_test.go
index 6afb5eee4..67e23c030 100644
--- a/tpl/template_funcs_test.go
+++ b/tpl/template_funcs_test.go
@@ -354,9 +354,14 @@ func TestIn(t *testing.T) {
 		expect bool
 	}{
 		{[]string{"a", "b", "c"}, "b", true},
+		{[]interface{}{"a", "b", "c"}, "b", true},
+		{[]interface{}{"a", "b", "c"}, "d", false},
 		{[]string{"a", "b", "c"}, "d", false},
 		{[]string{"a", "12", "c"}, 12, false},
 		{[]int{1, 2, 4}, 2, true},
+		{[]interface{}{1, 2, 4}, 2, true},
+		{[]interface{}{1, 2, 4}, nil, false},
+		{[]interface{}{nil}, nil, false},
 		{[]int{1, 2, 4}, 3, false},
 		{[]float64{1.23, 2.45, 4.67}, 1.23, true},
 		{[]float64{1.234567, 2.45, 4.67}, 1.234568, false},