diff --git a/_db/dbstructure_v1.6.sql b/_db/dbstructure_v1.6.sql
index 0397cf43..b79e90e6 100644
--- a/_db/dbstructure_v1.6.sql
+++ b/_db/dbstructure_v1.6.sql
@@ -2516,6 +2516,36 @@ INSERT INTO `uploadspeed` VALUES (1,'64kbps'),(2,'128kbps'),(3,'256kbps'),(4,'51
 /*!40000 ALTER TABLE `uploadspeed` ENABLE KEYS */;
 UNLOCK TABLES;
 
+--
+-- Table structure for table `user_ban_logs`
+--
+
+DROP TABLE IF EXISTS `user_ban_logs`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `user_ban_logs` (
+  `id` bigint(20) NOT NULL AUTO_INCREMENT,
+  `uid` int(11) NOT NULL DEFAULT '0',
+  `username` varchar(255) NOT NULL DEFAULT '',
+  `operator` int(11) NOT NULL DEFAULT '0',
+  `reason` varchar(255) DEFAULT NULL,
+  `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
+  `updated_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  KEY `idx_uid` (`uid`),
+  KEY `idx_username` (`username`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+--
+-- Dumping data for table `user_ban_logs`
+--
+
+LOCK TABLES `user_ban_logs` WRITE;
+/*!40000 ALTER TABLE `user_ban_logs` DISABLE KEYS */;
+/*!40000 ALTER TABLE `user_ban_logs` ENABLE KEYS */;
+UNLOCK TABLES;
+
 --
 -- Table structure for table `users`
 --
@@ -2673,4 +2703,4 @@ UNLOCK TABLES;
 /*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
 /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
 
--- Dump completed on 2021-05-11 11:16:24
+-- Dump completed on 2021-05-14  0:29:10
diff --git a/classes/class_advertisement.php b/classes/class_advertisement.php
index 571cd4dc..f848e94b 100644
--- a/classes/class_advertisement.php
+++ b/classes/class_advertisement.php
@@ -33,7 +33,7 @@ class ADVERTISEMENT{
 			return false;
 		else
 		{
-			if ($this->userrow['noad'] == 'yes')
+			if ($this->userrow && $this->userrow['noad'] == 'yes')
 				return false;
 			else
 				return true;
diff --git a/include/functions.php b/include/functions.php
index 74a92339..1f4e3059 100644
--- a/include/functions.php
+++ b/include/functions.php
@@ -1769,7 +1769,7 @@ function get_user_row($id)
 	global $Cache, $CURUSER;
 	static $curuserRowUpdated = false;
 	static $neededColumns = array('id', 'noad', 'class', 'enabled', 'privacy', 'avatar', 'signature', 'uploaded', 'downloaded', 'last_access', 'username', 'donor', 'leechwarn', 'warned', 'title');
-	if ($id == $CURUSER['id']) {
+	if ($CURUSER && $id == $CURUSER['id']) {
 		$row = array();
 		foreach($neededColumns as $column) {
 			$row[$column] = $CURUSER[$column];
@@ -2198,11 +2198,13 @@ function get_css_uri($file = "")
 
 function get_font_css_uri(){
 	global $CURUSER;
-	if ($CURUSER['fontsize'] == 'large')
-		$file = 'largefont.css';
-	elseif ($CURUSER['fontsize'] == 'small')
-		$file = 'smallfont.css';
-	else $file = 'mediumfont.css';
+    $file = 'mediumfont.css';
+    if ($CURUSER && isset($CURUSER['fontsize'])) {
+        if ($CURUSER['fontsize'] == 'large')
+            $file = 'largefont.css';
+        elseif ($CURUSER['fontsize'] == 'small')
+            $file = 'smallfont.css';
+    }
 	return "styles/".$file;
 }
 
@@ -2257,7 +2259,7 @@ function stdhead($title = "", $msgalert = true, $script = "", $place = "")
 
 	$Cache->setLanguage($CURLANGDIR);
 
-	$Advertisement = new ADVERTISEMENT($CURUSER['id']);
+	$Advertisement = new ADVERTISEMENT($CURUSER['id'] ?? 0);
 	$cssupdatedate = $cssdate_tweak;
 	// Variable for Start Time
 	$tstart = getmicrotime(); // Start time
diff --git a/public/user-ban-log.php b/public/user-ban-log.php
index d5ad0c55..f2776990 100644
--- a/public/user-ban-log.php
+++ b/public/user-ban-log.php
@@ -24,7 +24,7 @@ $filterForm = <<<FORM
 <div>
     <h1 style="text-align: center">User ban log</h1>
     <form id="filterForm" action="{$_SERVER['REQUEST_URI']}" method="get">
-        <input id="q" type="text" name="q" value="{$q}">
+        <input id="q" type="text" name="q" value="{$q}" placeholder="username">
         <input type="submit">
         <input type="reset" onclick="document.getElementById('q').value='';document.getElementById('filterForm').submit();">
     </form>