diff --git a/sources/application/UI/Base/Component/Pill/Pill.php b/sources/application/UI/Base/Component/Pill/Pill.php
index 57c361769..86bf4691a 100644
--- a/sources/application/UI/Base/Component/Pill/Pill.php
+++ b/sources/application/UI/Base/Component/Pill/Pill.php
@@ -121,12 +121,13 @@ class Pill extends UIContentBlock
 	}
 
 	/**
-	 * @param string $sTooltip
-	 *
 	 * @see static::$sTooltip
+	 *
+	 * @param string|null $sTooltip
+	 *
 	 * @return $this
 	 */
-	public function SetTooltip(string $sTooltip)
+	public function SetTooltip(?string $sTooltip)
 	{
 		$this->sTooltip = $sTooltip;