Convert passed params to a Hash unless it is

kaminari-core/lib/kaminari/helpers/tags.rb

@@ -24,7 +24,13 @@ def initialize(template, params: {}, param_name: nil, theme: nil, views_prefix:
         @params = @params.to_unsafe_h if @params.respond_to?(:to_unsafe_h)
         @params = @params.with_indifferent_access
         @params.except!(*PARAM_KEY_BLACKLIST)
-        @params.reverse_merge! params
+        # params in Rails 5 may not be a Hash either,
+        # so it must be converted to a Hash to be merged into @params
+        unless params.empty?
+          params = params.to_unsafe_h if params.respond_to?(:to_unsafe_h)
+          params = params.with_indifferent_access
+          @params.merge! params
+        end
       end
 
       def to_s(locals = {}) #:nodoc: