diff --git a/plugins/example.json b/plugins/example.json
index cce4ddb7..fc2fcbde 100644
--- a/plugins/example.json
+++ b/plugins/example.json
@@ -6,10 +6,13 @@
 	"contact": "nobody@example.org",
 	"require": {
 		"myaac": "0.4.3",
-		"myaac_": ">=0.7,<1.0", // support for defining versions like in composer (since 0.8.0)
+		"myaac_": ">=0.7,<1.0", // support for defining versions like in composer (since 0.8)
 		"php": "5.2.0",
-		"php_": ">5.4,<7.0", // support for defining versions like in composer (since 0.8.0)
-		"database": "21"
+		"php_": ">5.4,<7.0", // support for defining versions like in composer (since 0.8)
+		"database": "21",
+		"php-ext": "curl", // php extension needs to be installed (since 0.8)
+		"table": "accounts", // table need to exist in database (since 0.8)
+		"column": "players.online" // column need to exist in database (since 0.8)
 	},
 	"install": "plugins/example/install.php",
 	"uninstall": [
diff --git a/system/libs/plugins.php b/system/libs/plugins.php
index f41ed1ea..016fa526 100644
--- a/system/libs/plugins.php
+++ b/system/libs/plugins.php
@@ -180,15 +180,42 @@ class Plugins {
 								$continue = false;
 							}
 
-							foreach($require as $req => $version) {
-								if(in_array($req, array('myaac', 'myaac_', 'php', 'php_', 'database', 'database_'))) {
-									continue;
-								}
+							if($continue) {
+								foreach($require as $req => $version) {
+									if(in_array($req, array('myaac', 'myaac_', 'php', 'php_', 'database', 'database_'))) {
+										continue;
+									}
 
-								if(!self::is_installed($req, $version)) {
-									self::$error = "This plugin requires another plugin to run correctly. The another plugin is: " . $req . ", with version " . $version . ".";
-									$continue = false;
-									break;
+									$req = strtolower($req);
+									if(in_array($req, array('php-ext', 'php-extension'))) { // require php extension
+										if(!extension_loaded($version)) {
+											self::$error = "This plugin requires php extension: " . $version . " to be installed.";
+											$continue = false;
+											break;
+										}
+									}
+									else if($req == 'table') {
+										if(!$db->hasTable($version)) {
+											self::$error = "This plugin requires table: " . $version . " to exist in the database.";
+											$continue = false;
+											break;
+										}
+									}
+									else if($req == 'column') {
+										$tmp = explode('.', $version);
+										if(count($tmp) == 2) {
+											if(!$db->hasColumn($tmp[0], $tmp[1])) {
+												self::$error = "This plugin requires database column: " . $tmp[0] . "." . $tmp[1] . " to exist in database.";
+												$continue = false;
+												break;
+											}
+										}
+									}
+									else if(!self::is_installed($req, $version)) {
+										self::$error = "This plugin requires another plugin to run correctly. The another plugin is: " . $req . ", with version " . $version . ".";
+										$continue = false;
+										break;
+									}
 								}
 							}
 						}
diff --git a/system/libs/pot/OTS_DB_MySQL.php b/system/libs/pot/OTS_DB_MySQL.php
index 4b93b7dc..85656c65 100644
--- a/system/libs/pot/OTS_DB_MySQL.php
+++ b/system/libs/pot/OTS_DB_MySQL.php
@@ -197,7 +197,7 @@ class OTS_DB_MySQL extends OTS_Base_DB
 	}
 	
 	private function hasColumnInternal($table, $column) {
-		return ($this->has_column_cache[$table . '.' . $column] = count($this->query("SHOW COLUMNS FROM `" . $table . "` LIKE '" . $column . "'")->fetchAll()) > 0);
+		return $this->hasTable($table) && ($this->has_column_cache[$table . '.' . $column] = count($this->query("SHOW COLUMNS FROM `" . $table . "` LIKE '" . $column . "'")->fetchAll()) > 0);
 	}
 
 	public function revalidateCache() {