diff --git a/addons/geary-autoscan/src/main/kotlin/com/mineinabyss/geary/autoscan/AutoScannerDSL.kt b/addons/geary-autoscan/src/main/kotlin/com/mineinabyss/geary/autoscan/AutoScannerDSL.kt
index 035b385d..5aca91d4 100644
--- a/addons/geary-autoscan/src/main/kotlin/com/mineinabyss/geary/autoscan/AutoScannerDSL.kt
+++ b/addons/geary-autoscan/src/main/kotlin/com/mineinabyss/geary/autoscan/AutoScannerDSL.kt
@@ -68,7 +68,10 @@ class AutoScannerDSL(
                     scanned.forEach { scannedComponent ->
                         runCatching { component(scannedComponent) }
                             .onFailure {
-                                this@AutoScannerDSL.logger.w("Failed to register component ${scannedComponent.simpleName}\n${it.stackTraceToString()}")
+                                if (it is ClassNotFoundException)
+                                    this@AutoScannerDSL.logger.w("Failed to register component ${scannedComponent.simpleName}, class not found")
+                                else
+                                    this@AutoScannerDSL.logger.w("Failed to register component ${scannedComponent.simpleName}\n${it.stackTraceToString()}")
                             }
                     }
                 }
diff --git a/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/datatypes/Entity.kt b/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/datatypes/Entity.kt
index db612faa..52ba4f12 100644
--- a/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/datatypes/Entity.kt
+++ b/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/datatypes/Entity.kt
@@ -55,6 +55,9 @@ value class Entity(val id: EntityId) {
         entityProvider.remove(this)
     }
 
+    /** Checks whether this entity has not been removed. */
+    fun exists(): Boolean = read.exists(this)
+
     /**
      * Sets a component that holds data for this entity
      *
diff --git a/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/datatypes/maps/ArrayTypeMap.kt b/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/datatypes/maps/ArrayTypeMap.kt
index 5182321f..5590494d 100644
--- a/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/datatypes/maps/ArrayTypeMap.kt
+++ b/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/datatypes/maps/ArrayTypeMap.kt
@@ -28,6 +28,6 @@ class ArrayTypeMap : TypeMap {
 
     override operator fun contains(entity: Entity): Boolean {
         val id = entity.id.toInt()
-        return map.size < id && map[id] != null
+        return map.size > id && map[id] != null
     }
 }
diff --git a/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/engine/EntityReadOperations.kt b/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/engine/EntityReadOperations.kt
index 19a8b6f0..30c9a2a1 100644
--- a/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/engine/EntityReadOperations.kt
+++ b/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/engine/EntityReadOperations.kt
@@ -10,6 +10,9 @@ interface EntityReadOperations {
     /** Gets a list of all the components [entity] has, as well as relations in the form of [RelationComponent]. */
     fun getComponentsFor(entity: Entity): Array<Component>
 
+    /** Checks whether an [entity] is still active in the engine. */
+    fun exists(entity: Entity): Boolean
+
     /**
      * Gets relations in the same format as [Archetype.getRelations], but when kind/target [HOLDS_DATA], the appropriate
      * data is written to a [RelationWithData] object.
diff --git a/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/engine/archetypes/operations/ArchetypeReadOperations.kt b/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/engine/archetypes/operations/ArchetypeReadOperations.kt
index 0dd5af32..690cb915 100644
--- a/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/engine/archetypes/operations/ArchetypeReadOperations.kt
+++ b/geary-core/src/commonMain/kotlin/com/mineinabyss/geary/engine/archetypes/operations/ArchetypeReadOperations.kt
@@ -24,6 +24,10 @@ class ArchetypeReadOperations : EntityReadOperations {
         }
     }
 
+    override fun exists(entity: Entity): Boolean {
+        return records.contains(entity)
+    }
+
     override fun getRelationsWithDataFor(
         entity: Entity,
         kind: ComponentId,