==== What is the problem?
I can get the reportincident API endpoint (`rest.php/reportincident/v0/report/`) to return this error:
```
[error] [95ddb8d85aff8e32cb752e77] /w/rest.php/reportincident/v0/report PHP Warning: Trying to access array offset on value of type null
#0 /var/www/html/w/extensions/ReportIncident/src/Api/Rest/Handler/ReportHandler.php(88): MWExceptionHandler::handleError()
#1 /var/www/html/w/includes/Rest/SimpleHandler.php(38): MediaWiki\Extension\ReportIncident\Api\Rest\Handler\ReportHandler->run()
#2 /var/www/html/w/includes/Rest/Router.php(517): MediaWiki\Rest\SimpleHandler->execute()
#3 /var/www/html/w/includes/Rest/Router.php(422): MediaWiki\Rest\Router->executeHandler()
#4 /var/www/html/w/includes/Rest/EntryPoint.php(195): MediaWiki\Rest\Router->execute()
#5 /var/www/html/w/includes/Rest/EntryPoint.php(135): MediaWiki\Rest\EntryPoint->execute()
#6 /var/www/html/w/rest.php(31): MediaWiki\Rest\EntryPoint::main()
#7 {main}
....
[exception] [95ddb8d85aff8e32cb752e77] /w/rest.php/reportincident/v0/report InvalidArgumentException: Scalar parameter must be a string, number, or MessageValue; got NULL
#0 /var/www/html/w/includes/libs/Message/MessageValue.php(77): Wikimedia\Message\ScalarParam->__construct()
#1 /var/www/html/w/includes/libs/Message/MessageValue.php(35): Wikimedia\Message\MessageValue->params()
#2 /var/www/html/w/extensions/ReportIncident/src/Api/Rest/Handler/ReportHandler.php(92): Wikimedia\Message\MessageValue->__construct()
#3 /var/www/html/w/includes/Rest/SimpleHandler.php(38): MediaWiki\Extension\ReportIncident\Api\Rest\Handler\ReportHandler->run()
#4 /var/www/html/w/includes/Rest/Router.php(517): MediaWiki\Rest\SimpleHandler->execute()
#5 /var/www/html/w/includes/Rest/Router.php(422): MediaWiki\Rest\Router->executeHandler()
#6 /var/www/html/w/includes/Rest/EntryPoint.php(195): MediaWiki\Rest\Router->execute()
#7 /var/www/html/w/includes/Rest/EntryPoint.php(135): MediaWiki\Rest\EntryPoint->execute()
#8 /var/www/html/w/rest.php(31): MediaWiki\Rest\EntryPoint::main()
#9 {main}
```
This happens when a logged-in user with permission to submit the report incident form sends in a request that uses form data.
==== Steps to reproduce problem
# Setup a wiki with ReportIncident installed
# Login to an account that has not submitted a incident report within the last day.
# Run this command in your browser console (this performs a request to the API with form data):
```
await fetch("http://localhost:8080/w/rest.php/reportincident/v0/report", {
"headers": {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0",
"Accept": "application/json, text/javascript, */*; q=0.01",
"Accept-Language": "en-GB,en;q=0.5",
"Content-Type": "application/x-www-form-urlencoded",
"X-Requested-With": "XMLHttpRequest",
"Sec-Fetch-Dest": "empty",
"Sec-Fetch-Mode": "cors",
"Sec-Fetch-Site": "same-origin",
"Pragma": "no-cache",
"Cache-Control": "no-cache"
},
"referrer": "http://localhost:8080/wiki/User_talk:Dreamyjazz",
"body": "foobar",
"method": "POST"
});
```
**What happens**
I get a 500 server error as shown above
**What should happen**
A 4XX error (an error code starting with a 4) should be returned.
==== Environment
**Wiki(s):** 1.42.0-alpha (72f7b7a) 12:57, 18 October 2023. ReportIncident (b42b772) 12:22, 18 October 2023.