lib/jellyfish.rb in jellyfish-0.9.0 vs lib/jellyfish.rb in jellyfish-0.9.1

@@ -221,10 +221,10 @@
     handlers = self.class.handlers
     if handlers.key?(e.class)
       handlers[e.class]
     else # or find the nearest match and cache it
       ancestors         = e.class.ancestors
-      handlers[e.class] = handlers.
+      handlers[e.class] = handlers.dup. # thread safe iteration
         inject([nil, Float::INFINITY]){ |(handler, val), (klass, block)|
           idx = ancestors.index(klass) || Float::INFINITY # lower is better
           if idx < val then [block, idx] else [handler, val] end }.first
     end
   end