diff --git a/internal/collections/domain/collection/subject.go b/internal/collections/domain/collection/subject.go
index a28270e50..58618a1c8 100644
--- a/internal/collections/domain/collection/subject.go
+++ b/internal/collections/domain/collection/subject.go
@@ -129,7 +129,7 @@ func (s *Subject) UpdateTags(tags []string) error {
 		return nil
 	}
 
-	slice.Map(tags, strings.TrimSpace)
+	tags = slice.Map(tags, strings.TrimSpace)
 
 	if lo.ContainsBy(tags, func(item string) bool { return !dam.AllPrintableChar(item) }) {
 		return gerr.ErrInvisibleChar