diff --git a/src/generator/workers/_process-collection.scss b/src/generator/workers/_process-collection.scss
index 9d3df84..cd43a08 100644
--- a/src/generator/workers/_process-collection.scss
+++ b/src/generator/workers/_process-collection.scss
@@ -16,6 +16,7 @@
 
 @mixin process-collection($collection, $prefix, $selector, $is-breakpoint) {
   @each $key, $prop in $collection {
+    @if meta.type-of($prop) == 'map' {
     @debug "Key: #{$key}, Value: #{$prop}";
     $items: map-get($prop, 'items');
     @debug "Items: #{$items}";
@@ -62,4 +63,5 @@
       }
     }
   }
+}
 }
\ No newline at end of file