1 files changed, 1 insertions, 1 deletions

diff --git a/src/_props.scss b/src/_props.scss
index 25d3bf3..973d6b2 100644
--- a/src/_props.scss
+++ b/src/_props.scss
@@ -320,7 +320,7 @@ $iro-props-namespace-context-id: 'namespace' !default;
 @mixin iro-props-assign-internal($map, $prefix: '', $ref-depth: $iro-props-native-assing-max-depth) {
     @each $key, $value in $map {
         $rd: $ref-depth;
-        @if type-of($value) == list and nth($value, 1) == 'iro-prop-ref' {
+        @if type-of($value) == list and length($list) > 0 and nth($value, 1) == 'iro-prop-ref' {
             @if $ref-depth != 0 {
                 $rd: $rd - 1;
                 @if length($value) == 2 {