Adding false condition to sneakers_workers fetch array

lib/capistrano/tasks/sneakers.rb

@@ -90,7 +90,7 @@ namespace :sneakers do
     args = []
     if fetch(:sneakers_run_config) == true
       # Use sneakers configuration prebuilt in
-      raise "[ set :workers, ['worker1', 'workerN'] ] not configured properly, please configure the workers you wish to use" if fetch(:sneakers_workers).nil? or !fetch(:sneakers_workers).kind_of Array
+      raise "[ set :workers, ['worker1', 'workerN'] ] not configured properly, please configure the workers you wish to use" if fetch(:sneakers_workers).nil? or fetch(:sneakers_workers) == false or !fetch(:sneakers_workers).kind_of? Array
 
       workers = fetch(:sneakers_workers).compact.join(',')
       raise "Workers = #{workers}"