diff --git a/src/pocketmine/entity/Living.php b/src/pocketmine/entity/Living.php
index e2b9447f3..39610ff2c 100644
--- a/src/pocketmine/entity/Living.php
+++ b/src/pocketmine/entity/Living.php
@@ -544,7 +544,7 @@ abstract class Living extends Entity implements Damageable{
 			if($effect->canTick()){
 				$effect->applyEffect($this);
 			}
-			$effect->setDuration($effect->getDuration() - $tickDiff);
+			$effect->setDuration(max(0, $effect->getDuration() - $tickDiff));
 			if($effect->getDuration() <= 0){
 				$this->removeEffect($effect->getId());
 			}