diff --git a/core/inlineimage.class.inc.php b/core/inlineimage.class.inc.php
index 37232fded..a632045b1 100644
--- a/core/inlineimage.class.inc.php
+++ b/core/inlineimage.class.inc.php
@@ -259,12 +259,14 @@ class InlineImage extends DBObject
 	 * that refer to an InlineImage (detected via the attribute data-img-id="") so that
 	 * the URL is consistent with the current URL of the application.
 	 *
-	 * @param string $sHtml The HTML fragment to process
+N°8681	 * @param string|null $sHtml The HTML fragment to process
 	 *
 	 * @return string The modified HTML
 	 * @throws \Exception
+	 *
+	 * @since 3.3.0 N°8681 Add type hint for parameters and return value
 	 */
-	public static function FixUrls($sHtml)
+	public static function FixUrls(string|null $sHtml): string
 	{
 		// N°8681 - Ensure to have a string value
 		$sHtml = $sHtml ?? '';
diff --git a/sources/Core/AttributeDefinition/AttributeText.php b/sources/Core/AttributeDefinition/AttributeText.php
index c5727f288..b6386cf76 100644
--- a/sources/Core/AttributeDefinition/AttributeText.php
+++ b/sources/Core/AttributeDefinition/AttributeText.php
@@ -95,7 +95,19 @@ class AttributeText extends AttributeString
 		return 65535;
 	}
 
-	public static function RenderWikiHtml($sText, $bWikiOnly = false)
+	/**
+	 * @param string|null $sText
+	 * @param bool $bWikiOnly
+	 *
+	 * @return string
+	 * @throws \ArchivedObjectException
+	 * @throws \ConfigException
+	 * @throws \CoreException
+	 * @throws \DictExceptionMissingString
+	 *
+	 * @since 3.3.0 N°8681 Add type hint for parameters and return value
+	 */
+	public static function RenderWikiHtml(string|null $sText, bool $bWikiOnly = false): string
 	{
 		// N°8681 - Ensure to have a string value
 		$sText = $sText ?? '';