diff --git a/app/controllers/page_contents_controller.rb b/app/controllers/page_contents_controller.rb
index 62c6476..1b698bc 100644
--- a/app/controllers/page_contents_controller.rb
+++ b/app/controllers/page_contents_controller.rb
@@ -28,12 +28,15 @@ class PageContentsController < OrbitAdminController
       metas << {"property" => "og:image", "content" => URI.join(request.base_url, URI.encode(img_src)).to_s}
       if img_src.start_with?('/')
         img_src_path = File.join('public', img_src)
-        image = MiniMagick::Image.open(img_src_path)
-        if image[:width]
-          metas << {"property" => "og:image:width", "content" => image[:width].to_s}
-        end
-        if image[:height]
-          metas << {"property" => "og:image:height", "content" => image[:height].to_s}
+        img_src_path = URI.decode(img_src_path)
+        if File.exist?(img_src_path)
+          image = MiniMagick::Image.open(img_src_path)
+          if image[:width]
+            metas << {"property" => "og:image:width", "content" => image[:width].to_s}
+          end
+          if image[:height]
+            metas << {"property" => "og:image:height", "content" => image[:height].to_s}
+          end
         end
       else
         res = get_response(URI.parse(img_src))