diff --git a/lib/body_tracking/formula.rb b/lib/body_tracking/formula.rb
index 262dfa6..77d38b8 100644
--- a/lib/body_tracking/formula.rb
+++ b/lib/body_tracking/formula.rb
@@ -100,8 +100,7 @@ module BodyTracking
       end
 
       def valid?
-        self.validate if @quantities.nil?
-        !@quantities.nil?
+        @quantities || self.validate.empty?
       end
 
       def get_quantities