Rescan Multilingual Locale does not work

[mlocati]

1. Install concrete5 8.5.4
2. Login as admin
3. Go to the Dashboard → System → Multilingual → Multilingual Setup page
4. Add a second locale
5. Go to the Dashboard → System → Multilingual → Copy Languages page
6. Click the Rescan Locale in the Rescan Multilingual Tree section

You'll get this JSON error message:

{
   "errors":[
      "Serialization of 'Closure' is not allowed"
   ],
   "error":{
      "type":"Exception",
      "message":"Serialization of 'Closure' is not allowed",
      "file":"concrete/src/Foundation/Processor/ProcessorQueue.php",
      "line":89,
      "trace":[
         {
            "file":"concrete/src/Foundation/Processor/ProcessorQueue.php",
            "line":89,
            "function":null,
            "class":"Exception",
            "args":[
               "Serialization of 'Closure' is not allowed"
            ]
         },
         {
            "file":"concrete/src/Foundation/Processor/ProcessorQueue.php",
            "line":89,
            "function":"serialize",
            "class":null,
            "args":[
               {
                  "processor":{},
                  "subject":{
                     "cID":"193",
                     "cDisplayOrder":"0",
                     "cParentID":1,
                     "level":1,
                     "total":0
                  },
                  "target":{},
                  "task":{}
               }
            ]
         },
         {
            "file":"concrete/controllers/single_page/dashboard/system/multilingual/copy.php",
            "line":52,
            "function":"process",
            "class":"Concrete/Core/Foundation/Processor/ProcessorQueue",
            "args":[]
         },
      ]
   }
}

The reason of this issue is that we are calling serialize() on a multilingual Section, which contains a reference to a SiteTree entity, which is not yet fully loaded, so it contains an $__initializer__ property which has a Closure value, which can't be serialized by the PHP serialize() function.

[danielgasser]

confirmed

[mlocati]

@aembler which base branch should I use to submit a patch for this issue?

[aembler]

8.5.x for current development on 8.5 – and develop for version 9 if it's also present on 9

[marcelaerts]

Is there a way to fix this for 8.5.4? Instead of waiting for a new release?