lib/wice/columns.rb in wice_grid-7.1.3 vs lib/wice/columns.rb in wice_grid-7.1.4

@@ -144,10 +144,10 @@
       def add_css_class(klass_value) #:nodoc:
         self.html ||= {}
         if html[:class].nil?
           html[:class] = klass_value
         else
-          html[:class] << ' ' unless html[:class].empty?
+          html[:class] += ' ' unless html[:class].empty?
           html[:class] << klass_value
         end
       end
 
       def css_class #:nodoc: