diff --git a/src/pocketmine/permission/PermissibleBase.php b/src/pocketmine/permission/PermissibleBase.php
index 1f627785b..bec0fab46 100644
--- a/src/pocketmine/permission/PermissibleBase.php
+++ b/src/pocketmine/permission/PermissibleBase.php
@@ -30,7 +30,7 @@ use pocketmine\timings\Timings;
 
 class PermissibleBase implements Permissible{
 	/** @var ServerOperator */
-	private $opable = null;
+	private $opable;
 
 	/** @var Permissible */
 	private $parent = null;
@@ -59,24 +59,14 @@ class PermissibleBase implements Permissible{
 	 * @return bool
 	 */
 	public function isOp() : bool{
-		if($this->opable === null){
-			return false;
-		}else{
-			return $this->opable->isOp();
-		}
+		return $this->opable->isOp();
 	}
 
 	/**
 	 * @param bool $value
-	 *
-	 * @throws \Exception
 	 */
 	public function setOp(bool $value){
-		if($this->opable === null){
-			throw new \LogicException("Cannot change op value as no ServerOperator is set");
-		}else{
-			$this->opable->setOp($value);
-		}
+		$this->opable->setOp($value);
 	}
 
 	/**
diff --git a/src/pocketmine/plugin/PluginManager.php b/src/pocketmine/plugin/PluginManager.php
index 861ea2e1a..a709e253d 100644
--- a/src/pocketmine/plugin/PluginManager.php
+++ b/src/pocketmine/plugin/PluginManager.php
@@ -596,11 +596,7 @@ class PluginManager{
 	 * @return bool
 	 */
 	public function isPluginEnabled(Plugin $plugin) : bool{
-		if($plugin instanceof Plugin and isset($this->plugins[$plugin->getDescription()->getName()])){
-			return $plugin->isEnabled();
-		}else{
-			return false;
-		}
+		return isset($this->plugins[$plugin->getDescription()->getName()]) and $plugin->isEnabled();
 	}
 
 	/**
@@ -669,7 +665,7 @@ class PluginManager{
 					}elseif(is_string($data["permission"])){
 						$newCmd->setPermission($data["permission"]);
 					}else{
-						throw new \InvalidArgumentException("Permission must be a string or boolean, " . gettype($data["permission"] . " given"));
+						throw new \InvalidArgumentException("Permission must be a string or boolean, " . gettype($data["permission"]) . " given");
 					}
 				}