diff --git a/taiga/projects/tagging/validators.py b/taiga/projects/tagging/validators.py
index 4de1f395..779c247c 100644
--- a/taiga/projects/tagging/validators.py
+++ b/taiga/projects/tagging/validators.py
@@ -77,7 +77,7 @@ class EditTagTagValidator(ProjectTagValidator):
 
     def validate_color(self, attrs, source):
         color = attrs.get(source, None)
-        if not re.match('^\#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$', color):
+        if color and not re.match('^\#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$', color):
             raise ValidationError(_("The color is not a valid HEX color."))
 
         return attrs