[SOLVED] [2.12.3] DateField::serializeValue() must be of the type string

[WebGregGit]

Describe the bug
After accept form get stuck on the white page

To Reproduce
Steps to reproduce the behavior:

1. Create a form with 'Need to be validate?' per User
2. Create a question with a required datefield
3. Specify the target ticket.
4. Compleate a form and submit it.
5. Go to approving person account.
6. Accept form and... white page.

Expected behavior
Ticket should be create after accept form.

GLPI / Plugins (please complete the following information):

• GLPI version: 9.5.6

Plugins:
advancedplanning Name: advancedplanning Version: 0.2.0 State: Installed / not activated
impacts Name: Asset impacts Version: 2.0.5 State: Installed / not activated
databases Name: Bazy danych Version: 2.3.2 State: Enabled
browsernotification Name: Browser Notification Version: 1.1.9 State: Installed / not activated
datainjection Name: Data injection Version: 2.9.0 State: Enabled
fields Name: Dodatkowe pola Version: 1.12.8 State: Installed / not activated
mreporting Name: Dodatkowe raporty Version: 1.7.3 State: Enabled
pdf Name: Drukuj do PDF Version: 2.0.0 State: Enabled
formcreator Name: Form Creator Version: 2.12.3 State: Enabled
fpconsumables Name: FP Consumables Version: 1.3.0 State: Enabled
fusioninventory Name: FusionInventory Version: 9.5.0+1.0 State: Enabled
glpicheckingversion Name: GLPI Checking Version Version: 1.0.1 State: Installed / not activated
addressing Name: IP Adressing Version: 2.9.0 State: Enabled
mycustomview Name: MyCustomView Version: 1.2.1 State: Enabled
news Name: Powiadomienia Version: 1.9.0 State: Installed / not activated
printercounters Name: Printer counters Version: 1.7.0 State: Enabled
protocolsmanager Name: Protocols manager Version: 1.4.2 State: Enabled
dashboard Name: Pulpit Version: 1.0.2 State: Enabled
reports Name: Reports Version: 1.14.1 State: Enabled
room Name: Rooms Version: 3.1.3 State: Enabled
treeview Name: Tree view Version: 1.9.1 State: Enabled
typology Name: Typologies Version: 2.7.2 State: Enabled
useditemsexport Name: Used items export Version: 2.4.0 State: Enabled
watermark Name: Watermark Version: 1.0.0 State: Enabled
webresources Name: Web Resources Version: 1.3.2 State: Enabled
tag Name: Zarządzanie słowami kluczowymi Version: 2.8.1 State: Enabled

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Chrome
• Version: 96.0.4664.45 64-bit

Additional context
A message appears in debug mode: Uncaught Exception TypeError: Return value of GlpiPlugin\Formcreator\Field\DateField::serializeValue() must be of the type string, null returned in /var/www/html/glpi/marketplace/formcreator/inc/field/datefield.class.php at line 108

When the white page appears, I can refresh it and the form will be displayed saying that it has been approved, but the ticket will not be created. Rejection works fine ;)

edit: Maybe there is a connection with... If I set another question it is not visible unless the date field =/= empty - does not work for me.

I know that officialy this version is compatible with GLPI 9.5.5 only. Does this error result from it? Is there any chance for a fix before implementing GLPI 10?

[btry]

topic on forum : https://forum.glpi-project.org/viewtopic.php?id=282568

[btry]

Hi

The problem is very likely related to a date field. I think I need to know the language used when the error occurs, and an example of a date found in the field. I think the value may be important to reproduce.

[WebGregGit]

Hi @btry. Thank you for your message.
I use Polish. The error appeared both - when the field is empty and with a random date.

Edit: I just tried with english language - same.

[btry]

Hi

The issue is related to an other prolem.

Here is the fix f907076

related to #2462

[WebGregGit]

Thank You @btry - this is it :)