diff --git a/composer.json b/composer.json
index e50b7036b..319504456 100644
--- a/composer.json
+++ b/composer.json
@@ -41,7 +41,7 @@
       "pocketmine/classloader": "^0.2.0",
       "pocketmine/color": "^0.2.0",
       "pocketmine/errorhandler": "^0.6.0",
-      "pocketmine/locale-data": "~2.4.2",
+      "pocketmine/locale-data": "~2.5.0",
       "pocketmine/log": "^0.4.0",
       "pocketmine/log-pthreads": "^0.4.0",
       "pocketmine/math": "^0.4.0",
diff --git a/composer.lock b/composer.lock
index fdbc6fe27..1c6e915c9 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "2cece7458e6a61819972819606ac531e",
+    "content-hash": "2cadf5ed5a03fee920e46f4cfe5f819c",
     "packages": [
         {
             "name": "adhocore/json-comment",
@@ -536,16 +536,16 @@
         },
         {
             "name": "pocketmine/locale-data",
-            "version": "2.4.3",
+            "version": "2.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/pmmp/Language.git",
-                "reference": "4d0b081f1a79407e087968ea76aaf330db6ea2b5"
+                "reference": "df6fc7f2b48850b306c60466a11f7a27bb8fe1de"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/pmmp/Language/zipball/4d0b081f1a79407e087968ea76aaf330db6ea2b5",
-                "reference": "4d0b081f1a79407e087968ea76aaf330db6ea2b5",
+                "url": "https://api.github.com/repos/pmmp/Language/zipball/df6fc7f2b48850b306c60466a11f7a27bb8fe1de",
+                "reference": "df6fc7f2b48850b306c60466a11f7a27bb8fe1de",
                 "shasum": ""
             },
             "type": "library",
@@ -553,9 +553,9 @@
             "description": "Language resources used by PocketMine-MP",
             "support": {
                 "issues": "https://github.com/pmmp/Language/issues",
-                "source": "https://github.com/pmmp/Language/tree/2.4.3"
+                "source": "https://github.com/pmmp/Language/tree/2.5.0"
             },
-            "time": "2022-01-25T23:18:24+00:00"
+            "time": "2022-04-01T22:36:58+00:00"
         },
         {
             "name": "pocketmine/log",
diff --git a/src/lang/KnownTranslationFactory.php b/src/lang/KnownTranslationFactory.php
index d3b262d79..f006f937b 100644
--- a/src/lang/KnownTranslationFactory.php
+++ b/src/lang/KnownTranslationFactory.php
@@ -1829,6 +1829,10 @@ final class KnownTranslationFactory{
 		]);
 	}
 
+	public static function pocketmine_plugin_mainClassAbstract() : Translatable{
+		return new Translatable(KnownTranslationKeys::POCKETMINE_PLUGIN_MAINCLASSABSTRACT, []);
+	}
+
 	public static function pocketmine_plugin_mainClassNotFound() : Translatable{
 		return new Translatable(KnownTranslationKeys::POCKETMINE_PLUGIN_MAINCLASSNOTFOUND, []);
 	}
diff --git a/src/lang/KnownTranslationKeys.php b/src/lang/KnownTranslationKeys.php
index 1e488e2b8..038049d0a 100644
--- a/src/lang/KnownTranslationKeys.php
+++ b/src/lang/KnownTranslationKeys.php
@@ -379,6 +379,7 @@ final class KnownTranslationKeys{
 	public const POCKETMINE_PLUGIN_INVALIDMANIFEST = "pocketmine.plugin.invalidManifest";
 	public const POCKETMINE_PLUGIN_LOAD = "pocketmine.plugin.load";
 	public const POCKETMINE_PLUGIN_LOADERROR = "pocketmine.plugin.loadError";
+	public const POCKETMINE_PLUGIN_MAINCLASSABSTRACT = "pocketmine.plugin.mainClassAbstract";
 	public const POCKETMINE_PLUGIN_MAINCLASSNOTFOUND = "pocketmine.plugin.mainClassNotFound";
 	public const POCKETMINE_PLUGIN_MAINCLASSWRONGTYPE = "pocketmine.plugin.mainClassWrongType";
 	public const POCKETMINE_PLUGIN_RESTRICTEDNAME = "pocketmine.plugin.restrictedName";
diff --git a/src/plugin/PluginManager.php b/src/plugin/PluginManager.php
index f26e13a44..f996e58e4 100644
--- a/src/plugin/PluginManager.php
+++ b/src/plugin/PluginManager.php
@@ -166,6 +166,14 @@ class PluginManager{
 			)));
 			return null;
 		}
+		$reflect = new \ReflectionClass($mainClass); //this shouldn't throw; we already checked that it exists
+		if(!$reflect->isInstantiable()){
+			$this->server->getLogger()->error($language->translate(KnownTranslationFactory::pocketmine_plugin_loadError(
+				$description->getName(),
+				KnownTranslationFactory::pocketmine_plugin_mainClassAbstract()
+			)));
+			return null;
+		}
 
 		$permManager = PermissionManager::getInstance();
 		foreach($description->getPermissions() as $permsGroup){