lib/reveal-ck/commands/thread_waker.rb in reveal-ck-3.9.2 vs lib/reveal-ck/commands/thread_waker.rb in reveal-ck-4.0.0

@@ -9,10 +9,10 @@
 
       def run
         Thread.new do
           loop do
             sleep @wait_period
-            @thread_to_wake.wakeup
+            @thread_to_wake.wakeup if @thread_to_wake.alive?
           end
         end
       end
     end
   end