diff --git a/changelogs/4.2.md b/changelogs/4.2.md
index 337a17943..ac1124dda 100644
--- a/changelogs/4.2.md
+++ b/changelogs/4.2.md
@@ -19,3 +19,12 @@ Released 19th February 2022.
 ## Fixes
 - Fixed multiple players being able to sleep in the same bed.
 - Fixed hitbox not resetting properly after swimming or gliding.
+
+# 4.2.2
+Released 2nd March 2022.
+
+## Fixes
+- Fixed crash in `/dumpmemory` due to usage of non-printable string keys in `CraftingManager`. Array contents in memory dumps are now rendered as prettified key-value pairs.
+- Fixed output directory for `/dumpmemory`.
+- `PlayerInventory->isHotbarSlot()` now correctly returns `false` when given `9`.
+- Fixed ghost items left in the inventory when dropping tools while mining.
diff --git a/src/plugin/PluginManager.php b/src/plugin/PluginManager.php
index 529fe5bbe..f26e13a44 100644
--- a/src/plugin/PluginManager.php
+++ b/src/plugin/PluginManager.php
@@ -435,10 +435,11 @@ class PluginManager{
 
 			$plugin->getScheduler()->setEnabled(true);
 			$plugin->onEnableStateChange(true);
+			if($plugin->isEnabled()){ //the plugin may have disabled itself during onEnable()
+				$this->enabledPlugins[$plugin->getDescription()->getName()] = $plugin;
 
-			$this->enabledPlugins[$plugin->getDescription()->getName()] = $plugin;
-
-			(new PluginEnableEvent($plugin))->call();
+				(new PluginEnableEvent($plugin))->call();
+			}
 		}
 	}
 
diff --git a/src/scheduler/TaskScheduler.php b/src/scheduler/TaskScheduler.php
index f66bd857a..c194b0b2b 100644
--- a/src/scheduler/TaskScheduler.php
+++ b/src/scheduler/TaskScheduler.php
@@ -130,6 +130,9 @@ class TaskScheduler{
 	}
 
 	public function mainThreadHeartbeat(int $currentTick) : void{
+		if(!$this->enabled){
+			throw new \LogicException("Cannot run heartbeat on a disabled scheduler");
+		}
 		$this->currentTick = $currentTick;
 		while($this->isReady($this->currentTick)){
 			/** @var TaskHandler $task */