update

src/mcts.jl

@@ -177,9 +177,14 @@ function simulate(a, node::MCTSNode, decisionMaker::Function, progressValueEstim
     if node.isterminal
       break
     else
+      try
         simTrajectoryReward += node.reward
         expand(a, node, decisionMaker, progressValueEstimator, isterminal, n=n)
         node = selectChildNode(node)
+      catch
+        # if error occurs, break and try again later
+        break
+      end
     end
   end