Avoid duplicated multibyte tags

diff --git a/src/Protocol/PortableContact.php b/src/Protocol/PortableContact.php
index f7ea27d67972522d2efa3bc3d9994a3676145d59..06c2636aca8b33931ede15a5494feeda4f078267 100644 (file)
--- a/src/Protocol/PortableContact.php
+++ b/src/Protocol/PortableContact.php
@@ -1421,7 +1421,7 @@ class PortableContact
                        // Avoid duplicates
                        $tags = [];
                        foreach ($data->tags as $tag) {
-                               $tag = strtolower($tag);
+                               $tag = mb_strtolower($tag);
                                $tags[$tag] = $tag;
                        }