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Core Module Export/Import – Error


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I tried to import pages from another pw-installation
The process results in an error as soon as it starts doing the import. All steps before ok (choosing destination, linking fields, …) working fine.
PW creates one page, sets the page name but is not able to set the page title and gives this error:

Schwerwiegender Fehler: Uncaught Error: Call to a member function setLanguageValue() on null in wire/modules/LanguageSupport/FieldtypeTextLanguage.module:159

#0 wire/modules/LanguageSupport/FieldtypeTextareaLanguage.module (114): FieldtypeTextLanguage->___importValue(Object(Page), Object(Field), Array, Array)
#1 [internal function]: FieldtypeTextareaLanguage->___importValue(Object(Page), Object(Field), Array, Array)
#2 wire/core/Wire.php (425): call_user_func_array(Array, Array)
#3 wire/core/WireHooks.php (952): Wire->_callMethod('___importValue', Array)
#4 wire/core/Wire.php (484): WireHooks->runHooks(Object(FieldtypeTextareaLanguage), 'importValue', Array)
#5 wire/core/PagesExportImport.php (957): Wire->__call('importValue', Arr (Zeile 159 in wire/modules/LanguageSupport/FieldtypeTextLanguage.module)

Diese Fehlermeldung wurde angezeigt wegen: Sie sind als Superuser angemeldet. Fehler wurde protokolliert.

Both sites have the same languages installed (default/de)

This is an example of my json:

    "type": "ProcessWire:PageArray",
    "created": "2023-05-18 11:32:25",
    "version": "3.0.200",
    "user": "admin",
    "host": "website.com",
    "pages": [
            "type": "ProcessWire:Page",
            "path": "/path/path/some-title/",
            "class": "ProcessWire\\Page",
            "template": "team_member",
            "settings": {
                "id": 13702,
                "name": "some-title",
                "status": 1,
                "sort": 31,
                "sortfield": "sort",
                "created": "28-03-2022 18:39:22",
                "modified": "28-03-2022 18:46:39",
                "name_en": null,
                "status_en": 1
            "data": {
                "title": {
                    "default": "Name LÖL",
                    "en": "Name LÖL"
                "headline": {
                    "default": "",
                    "en": ""
                "phone": "0987654321",
                "email": "email@website.com",
                "body": {
                    "default": "<p>text</p>",
                    "en": ""


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