diff --git a/wcfsetup/install/files/lib/system/form/builder/field/ItemListFormField.class.php b/wcfsetup/install/files/lib/system/form/builder/field/ItemListFormField.class.php
index 2d6e5019d33..457e1fee4ae 100644
--- a/wcfsetup/install/files/lib/system/form/builder/field/ItemListFormField.class.php
+++ b/wcfsetup/install/files/lib/system/form/builder/field/ItemListFormField.class.php
@@ -245,6 +245,10 @@ public function value($value)
                 throw new \LogicException("Unreachable");
         }
 
+        // If the input value is an empty string then the resulting array will
+        // contain exactly one empty string element.
+        $this->value = ArrayUtil::trim($this->value);
+
         return $this;
     }