diff --git a/composer.json b/composer.json
index 3442e81e3..6d654e6c0 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
       "ocramius/package-versions": "^1.5"
    },
    "require-dev": {
-      "phpstan/phpstan": "^0.12.14",
+      "phpstan/phpstan": "^0.12.19",
       "irstea/phpunit-shim": "^8.5",
       "phpstan/phpstan-phpunit": "^0.12.6",
       "phpstan/phpstan-strict-rules": "^0.12.2"
diff --git a/composer.lock b/composer.lock
index 11a346650..2a51a4138 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": "86ad0aed5ce88fa096c73bced8c79348",
+    "content-hash": "d717744d5a481a98d003220e3e6d932b",
     "packages": [
         {
             "name": "adhocore/json-comment",
@@ -529,21 +529,24 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "0.12.18",
+            "version": "0.12.19",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "1ce27fe29c8660a27926127d350d53d80c4d4286"
+                "reference": "054f6d76b12ba9a6c13a5a8d5fcdf51219615f4d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/1ce27fe29c8660a27926127d350d53d80c4d4286",
-                "reference": "1ce27fe29c8660a27926127d350d53d80c4d4286",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/054f6d76b12ba9a6c13a5a8d5fcdf51219615f4d",
+                "reference": "054f6d76b12ba9a6c13a5a8d5fcdf51219615f4d",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.1"
             },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
             "bin": [
                 "phpstan",
                 "phpstan.phar"
@@ -564,7 +567,21 @@
                 "MIT"
             ],
             "description": "PHPStan - PHP Static Analysis Tool",
-            "time": "2020-03-22T16:51:47+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://www.patreon.com/phpstan",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-04-19T20:35:10+00:00"
         },
         {
             "name": "phpstan/phpstan-phpunit",
diff --git a/src/pocketmine/level/generator/populator/Populator.php b/src/pocketmine/level/generator/populator/Populator.php
index c69d04a03..f97b59189 100644
--- a/src/pocketmine/level/generator/populator/Populator.php
+++ b/src/pocketmine/level/generator/populator/Populator.php
@@ -32,7 +32,7 @@ use pocketmine\utils\Random;
 abstract class Populator{
 
 	/**
-	 * @return mixed
+	 * @return void
 	 */
 	abstract public function populate(ChunkManager $level, int $chunkX, int $chunkZ, Random $random);
 }
diff --git a/tests/phpstan/configs/runtime-type-checks.neon b/tests/phpstan/configs/runtime-type-checks.neon
index 650cfe92e..8ec99fe95 100644
--- a/tests/phpstan/configs/runtime-type-checks.neon
+++ b/tests/phpstan/configs/runtime-type-checks.neon
@@ -1,7 +1,7 @@
 parameters:
 	ignoreErrors:
 		-
-			message: "#^Call to function is_subclass_of\\(\\) with class\\-string\\<pocketmine\\\\level\\\\generator\\\\Generator\\> and 'pocketmine\\\\\\\\level…' will always evaluate to true\\.$#"
+			message: "#^Call to function is_subclass_of\\(\\) with class\\-string\\<pocketmine\\\\level\\\\generator\\\\Generator\\> and 'pocketmine\\\\\\\\level\\\\\\\\generator\\\\\\\\Generator' will always evaluate to true\\.$#"
 			count: 1
 			path: ../../../src/pocketmine/Server.php
 
@@ -66,7 +66,7 @@ parameters:
 			path: ../../../src/pocketmine/level/Level.php
 
 		-
-			message: "#^Call to function is_subclass_of\\(\\) with class\\-string\\<pocketmine\\\\level\\\\generator\\\\Generator\\> and 'pocketmine\\\\\\\\level…' will always evaluate to true\\.$#"
+			message: "#^Call to function is_subclass_of\\(\\) with class\\-string\\<pocketmine\\\\level\\\\generator\\\\Generator\\> and 'pocketmine\\\\\\\\level\\\\\\\\generator\\\\\\\\Generator' will always evaluate to true\\.$#"
 			count: 1
 			path: ../../../src/pocketmine/level/generator/GeneratorManager.php
 
@@ -76,7 +76,7 @@ parameters:
 			path: ../../../src/pocketmine/plugin/PluginManager.php
 
 		-
-			message: "#^Call to function is_subclass_of\\(\\) with class\\-string\\<pocketmine\\\\event\\\\Event\\> and 'pocketmine\\\\\\\\event…' will always evaluate to true\\.$#"
+			message: "#^Call to function is_subclass_of\\(\\) with class\\-string\\<pocketmine\\\\event\\\\Event\\> and 'pocketmine\\\\\\\\event\\\\\\\\Event' will always evaluate to true\\.$#"
 			count: 1
 			path: ../../../src/pocketmine/plugin/PluginManager.php