diff --git a/lib/image_optim/worker/pngout.rb b/lib/image_optim/worker/pngout.rb
index 9823ab03..ffa69d04 100644
--- a/lib/image_optim/worker/pngout.rb
+++ b/lib/image_optim/worker/pngout.rb
@@ -32,6 +32,10 @@ def optimize(src, dst)
           #{dst}
         ]
         execute(:pngout, *args) && optimized?(src, dst)
+      rescue SignalException => e
+        raise unless Signal.list.key(e.signo) == 'SEGV'
+        raise unless resolve_bin!(:pngout).version <= '20150920'
+        warn "pngout caused Segmentation fault for #{src}"
       end
     end
   end