fixed bug when clicking cancel

class.php

@@ -86,6 +86,10 @@ class ps4 {
 			$sql = "UPDATE game_thumbnail SET thumbnail_url = '".$url."' WHERE game_id = '".$gameid."';";
 		}
 
+		if (($url == "") or ($url == "null")) {
+			echo "<strong>ERROR:</strong> No URL specified.";
+			echo "<br/><br/>";
+		} else {
 			$result = $this->mysql_conn($sql);
 			if ($result == 1) {
 				echo "<strong>SUCCESS:</strong> Updated image URL for <strong>". $gamename ."</strong> (". $gameid .")";
@@ -96,6 +100,8 @@ class ps4 {
 			}
 		}
 
+	}
+
 }
 
 ?>