diff --git a/src/pocketmine/entity/Effect.php b/src/pocketmine/entity/Effect.php
index 942ec62f5..9357cb490 100644
--- a/src/pocketmine/entity/Effect.php
+++ b/src/pocketmine/entity/Effect.php
@@ -116,7 +116,7 @@ class Effect{
 
 	protected $duration;
 
-	protected $amplifier;
+	protected $amplifier = 0;
 
 	protected $color;