array_key_exists(): Argument #2 ($array) must be of type array, string given in FileParameterBag Description

[lucamillers]

While working with file uploads in Contao 4.13 using the Terminal42\mp_forms-Bundle (5.2.0), I encountered an issue where the array_key_exists() function throws an error because it is given a string instead of an array. This issue occurs in the set method of the FileParameterBag class.

To reproduce:
My case was a checkbox-menu that (thanks to conditionalFormFields) showed the user two input fields based on the checkbox-selection, a text box and a file-upload-widget. When trying to upload a file, upon clicking next, I'm getting the following error:

[fritzmg]

Even if the original error is fixed (by #84) you will still get a InvalidArgumentException error.

[zonky2]

I have Contao 4.13.52 and MP_Form 5.2.0 and also run into the error of #84

If I turn && into ||, I run into the exception
$value must be an array normalized by the FileUploadNormalizer service.

I have inserted a dump before the foreach on $value - it looks like this - according to the source code it should have one more level.

array:7 [▼
  "name" => "test__8.pdf"
  "type" => "application/pdf"
  "tmp_name" => "/kunden/1234/files/upload/call_2025/test01/test__8.pdf"
  "error" => 0
  "size" => 27678
  "uploaded" => true
  "uuid" => "0cde4c6b-d98f-11ef-bfa2-0242ac1b9908"
]

``In the form I have the normal upload field and not the FineUploader.

[mapfei]

How can the error be solved? I am using a customer installation with Contao 4.13.50 and mp-forms 5.2.0.

This is the complete error message:

[2025-01-27T07:14:55.174674+00:00] request.INFO: Matched route "tl_page.2650". {"route":"tl_page.2650","route_parameters":{"_controller":"Contao\\FrontendIndex::renderPage","_scope":"frontend","_locale":"de","_format":"html","_canonical_route":"tl_page.2650","parameters":"","pageModel":{"Contao\\PageModel":[]},"_route":"tl_page.2650","_route_object":{"Contao\\CoreBundle\\Routing\\Page\\PageRoute":[]}},"request_uri":"/online?ref=52d9075a2b0aee430f45a0ef5e8e67be&step=4","method":"POST"} []
[2025-01-27T08:14:55.185977+01:00] security.INFO: Populated the TokenStorage with an anonymous Token. [] []
[2025-01-27T08:14:55.481275+01:00] contao.files.INFO: File "files/bewerbungen_rem-cpm/test__4.pdf" has been uploaded [] {"contao":{"Contao\\CoreBundle\\Monolog\\ContaoContext":"{\"func\":\"Contao\\\\FormFileUpload::validate\",\"action\":\"FILES\",\"username\":\"anon.\",\"browser\":\"Mozilla\\/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit\\/537.36 (KHTML, like Gecko) Chrome\\/131.0.0.0 Safari\\/537.36\"}"}}
[2025-01-27T07:14:55.590938+00:00] request.CRITICAL: Uncaught PHP Exception TypeError: "array_key_exists(): Argument #2 ($array) must be of type array, string given" at /vendor/terminal42/contao-mp_forms/src/Step/FileParameterBag.php line 33 {"exception":"[object] (TypeError(code: 0): array_key_exists(): Argument #2 ($array) must be of type array, string given at /vendor/terminal42/contao-mp_forms/src/Step/FileParameterBag.php:33)"} []

[Toflar]

Should be fixed with 5.2.1, I guess?