diff --git a/src/General/Index.coffee b/src/General/Index.coffee
index 555373c33..8de81dd4c 100644
--- a/src/General/Index.coffee
+++ b/src/General/Index.coffee
@@ -721,7 +721,8 @@ Index =
           thread.setPage(Index.threadPosition[ID] // Index.threadsNumPerPage + 1)
         else
           obj = Index.parsedThreads[ID]
-          OP = new Post g.SITE.Build.post(obj), thread, g.BOARD
+          opRoot = g.SITE.Build.post(obj)
+          OP = new Post opRoot, thread, g.BOARD
           OP.filterResults = obj.filterResults
           newPosts.push OP
 
@@ -733,6 +734,7 @@ Index =
         errors.push
           message: "Parsing of Thread No.#{thread} failed. Thread will be skipped."
           error: err
+          html: opRoot?.outerHTML
     Main.handleErrors errors if errors
 
     if withReplies
@@ -763,6 +765,7 @@ Index =
           errors.push
             message: "Parsing of Post No.#{data.no} failed. Post will be skipped."
             error: err
+            html: node?.outerHTML
       $.add thread.nodes.root, nodes
 
     Main.handleErrors errors if errors
diff --git a/src/main/Main.coffee b/src/main/Main.coffee
index 2d3236e56..07239c33b 100644
--- a/src/main/Main.coffee
+++ b/src/main/Main.coffee
@@ -382,6 +382,7 @@ Main =
         errors.push
           message: "Parsing of Post No.#{postRoot.id.match(/\d+/)} failed. Post will be skipped."
           error: err
+          html: postRoot.outerHTML
     return
 
   addThreads: (records) ->
@@ -458,6 +459,7 @@ Main =
         errors.push
           message: "Parsing of Catalog Thread No.#{(threadRoot.dataset.id or threadRoot.id).match(/\d+/)} failed. Thread will be skipped."
           error: err
+          html: threadRoot.outerHTML
     return
 
   addCatalogThreads: (records) ->
@@ -560,9 +562,11 @@ Main =
       [Please describe the steps needed to reproduce this error.]
 
       Script: <%= meta.name %> <%= meta.fork %> v#{g.VERSION} #{$.platform}
-      User agent: #{navigator.userAgent}
       URL: #{location.href}
+      User agent: #{navigator.userAgent}
     """
+    if $.platform is 'userscript' and (info = if GM? then GM.info else (if GM_info? then GM_info))
+      addDetails "Userscript manager: #{info.scriptHandler} #{info.version}"
     addDetails '\n' + data.error
     addDetails data.error.stack.replace(data.error.toString(), '').trim() if data.error.stack
     addDetails '\n`' + data.html + '`' if data.html