diff --git a/acptemplate/chatSuspensionList.tpl b/acptemplate/chatSuspensionList.tpl
index 773dbaa..3e523c7 100644
--- a/acptemplate/chatSuspensionList.tpl
+++ b/acptemplate/chatSuspensionList.tpl
@@ -83,7 +83,7 @@
 				<dt><label for="suspensionType">{lang}chat.acp.suspension.type{/lang}</label></dt>
 				<dd>
 					<select id="suspensionType" name="suspensionType">
-						<option value=""{if $suspensionType == null} selected="selected"{/if}></option>
+						<option value=""{if $suspensionType === null} selected="selected"{/if}></option>
 						<option value="{'\chat\data\suspension\Suspension::TYPE_MUTE'|constant}"{if $suspensionType == '\chat\data\suspension\Suspension::TYPE_MUTE'|constant} selected="selected"{/if}>{lang}chat.suspension.{'\chat\data\suspension\Suspension::TYPE_MUTE'|constant}{/lang}</option>
 						<option value="{'\chat\data\suspension\Suspension::TYPE_BAN'|constant}"{if $suspensionType == '\chat\data\suspension\Suspension::TYPE_BAN'|constant} selected="selected"{/if}>{lang}chat.suspension.{'\chat\data\suspension\Suspension::TYPE_BAN'|constant}{/lang}</option>
 					</select>
diff --git a/file/lib/acp/page/ChatSuspensionListPage.class.php b/file/lib/acp/page/ChatSuspensionListPage.class.php
index ee00ed3..5982057 100644
--- a/file/lib/acp/page/ChatSuspensionListPage.class.php
+++ b/file/lib/acp/page/ChatSuspensionListPage.class.php
@@ -116,7 +116,7 @@ public function readParameters() {
 			if (!$room->permanent) throw new \wcf\system\exception\PermissionDeniedException();
 		}
 		
-		if (isset($_REQUEST['suspensionType']) && !empty($_REQUEST['suspensionType'])) $this->filterSuspensionType = intval($_REQUEST['suspensionType']);
+		if (isset($_REQUEST['suspensionType']) && !empty($_REQUEST['suspensionType'])) $this->filterSuspensionType = \wcf\util\StringUtil::trim($_REQUEST['suspensionType']);
 		
 		// display revoked
 		if (isset($_REQUEST['displayRevoked'])) $this->displayRevoked = intval($_REQUEST['displayRevoked']);