diff --git a/wcfsetup/install/files/lib/system/option/RadioButtonOptionType.class.php b/wcfsetup/install/files/lib/system/option/RadioButtonOptionType.class.php
index eb88734f409..c68cf590648 100644
--- a/wcfsetup/install/files/lib/system/option/RadioButtonOptionType.class.php
+++ b/wcfsetup/install/files/lib/system/option/RadioButtonOptionType.class.php
@@ -105,7 +105,7 @@ public function getCondition(PreparedStatementConditionBuilder &$conditions, Opt
             return false;
         }
 
-        $conditions->add("option_value.userOption" . $option->optionID . " = ?", [StringUtil::trim($value)]);
+        $conditions->add("option_value.userOption" . $option->optionID . " = ?", [StringUtil::trim($value ?: '')]);
 
         return true;
     }