From 139ea099679b96537283a6c154dd219c95afa425 Mon Sep 17 00:00:00 2001
From: Pat Hawks <pat@pathawks.com>
Date: Tue, 2 Oct 2018 06:27:15 -0500
Subject: [PATCH] Do not dump undumpable objects (#7190)

Merge pull request 7190
---
 lib/jekyll/cache.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/jekyll/cache.rb b/lib/jekyll/cache.rb
index abf3610c..66f1d18e 100644
--- a/lib/jekyll/cache.rb
+++ b/lib/jekyll/cache.rb
@@ -60,7 +60,10 @@ module Jekyll
       return unless @@disk_cache_enabled
 
       path = path_to(hash(key))
+      value = new Hash(value) if value.is_a?(Hash) && !value.default.nil?
       dump(path, value)
+    rescue TypeError
+      Jekyll.logger.debug "Cache:", "Cannot dump object #{key}"
     end
 
     # If an item already exists in the cache, retrieve it