fix: game crashing on entering some levels

Assets/Prefabs/Enemies/Dice_Enemy_0.5.prefab

@@ -81,10 +81,10 @@ PrefabInstance:
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       insertIndex: -1
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       insertIndex: -1
-      addedObject: {fileID: 7925268694638970133}
+      addedObject: {fileID: 8062664184138368341}
   m_SourcePrefab: {fileID: 100100000, guid: f1ba87c0234acfa4da251bb1bf3fe963, type: 3}
 --- !u!1 &7324912429315955413 stripped
 GameObject:
@@ -112,6 +112,27 @@ SphereCollider:
   serializedVersion: 3
   m_Radius: 0.034196023
   m_Center: {x: 0.000000018626451, y: -0.000000013038518, z: 0.000000014901165}
+--- !u!114 &7925268694638970133
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+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
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+  m_Script: {fileID: 11500000, guid: 53554f0e5c5ef3146a592d5dfe75e390, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  hp: 100
+  prefab: {fileID: 0}
+  detectionRadius: 5
+  patrollRadius: 3
+  damage: 5
+  attackRate: 1
+  attackRadius: 1
+  target: {fileID: 0}
+  currentState: 0
 --- !u!195 &8062664184138368341
 NavMeshAgent:
   m_ObjectHideFlags: 0
@@ -134,24 +155,3 @@ NavMeshAgent:
   m_BaseOffset: 0.033343785
   m_WalkableMask: 4294967295
   m_ObstacleAvoidanceType: 4
---- !u!114 &7925268694638970133
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-  m_Name: 
-  m_EditorClassIdentifier: 
-  hp: 100
-  prefab: {fileID: 0}
-  detectionRadius: 5
-  patrollRadius: 3
-  damage: 5
-  attackRate: 1
-  attackRadius: 1
-  target: {fileID: 0}
-  currentState: 0

Assets/Scenes/Level1.unity

@@ -1445,7 +1445,7 @@ MonoBehaviour:
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   m_VoxelSize: 0.16666667
   m_MinRegionArea: 2
-  m_NavMeshData: {fileID: 23800000, guid: 94503c9617c3db6459977597f152b6f0, type: 2}
+  m_NavMeshData: {fileID: 23800000, guid: fff27cd9af0b5ef4c8ae1bab79c1f9dc, type: 2}
   m_BuildHeightMesh: 0
 --- !u!4 &2057016901
 Transform:
@@ -1893,5 +1893,5 @@ SceneRoots:
   - {fileID: 1481837882}
   - {fileID: 512102627}
   - {fileID: 1311630986}
-  - {fileID: 2057016901}
   - {fileID: 556875446353582464}
+  - {fileID: 2057016901}

Assets/Scenes/Level1/NavMesh-NavMesh Surface.asset.meta

@@ -1,5 +1,5 @@
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+guid: fff27cd9af0b5ef4c8ae1bab79c1f9dc
 NativeFormatImporter:
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   mainObjectFileID: 23800000

Assets/Scenes/Level2.meta

@@ -0,0 +1,8 @@
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+guid: e09188000d3ef1841b8a2d8144b3027f
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scenes/Level2.unity

@@ -584,6 +584,70 @@ PrefabInstance:
     m_AddedGameObjects: []
     m_AddedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: 5157f3098ce9b0d4282980ecd17a9ec3, type: 3}
+--- !u!1 &838620468
+GameObject:
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+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 838620470}
+  - component: {fileID: 838620469}
+  m_Layer: 0
+  m_Name: NavMesh Surface
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!114 &838620469
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+  m_Script: {fileID: 11500000, guid: 7a5ac11cc976e418e8d13136b07e1f52, type: 3}
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+  m_AgentTypeID: 0
+  m_CollectObjects: 0
+  m_Size: {x: 10, y: 10, z: 10}
+  m_Center: {x: 0, y: 2, z: 0}
+  m_LayerMask:
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+    m_Bits: 64
+  m_UseGeometry: 0
+  m_DefaultArea: 0
+  m_GenerateLinks: 0
+  m_IgnoreNavMeshAgent: 1
+  m_IgnoreNavMeshObstacle: 1
+  m_OverrideTileSize: 0
+  m_TileSize: 256
+  m_OverrideVoxelSize: 0
+  m_VoxelSize: 0.16666667
+  m_MinRegionArea: 2
+  m_NavMeshData: {fileID: 23800000, guid: 185381146626af94589ceb547d598db4, type: 2}
+  m_BuildHeightMesh: 0
+--- !u!4 &838620470
+Transform:
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+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 838620468}
+  serializedVersion: 2
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
+  m_Children: []
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+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!1 &840308436
 GameObject:
   m_ObjectHideFlags: 0
@@ -1568,3 +1632,4 @@ SceneRoots:
   - {fileID: 237025644}
   - {fileID: 240409401}
   - {fileID: 1718333314}
+  - {fileID: 838620470}

Assets/Scenes/Level2/NavMesh-NavMesh Surface.asset.meta

@@ -0,0 +1,8 @@
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+guid: 185381146626af94589ceb547d598db4
+NativeFormatImporter:
+  externalObjects: {}
+  mainObjectFileID: 23800000
+  userData: 
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Assets/Scenes/Level3.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: cdc0a12f4d9770e4aa644986d36ff632
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scenes/Level3.unity

@@ -268,6 +268,70 @@ PrefabInstance:
     m_AddedGameObjects: []
     m_AddedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: ca28c894d7e3a8e4d8feb70b9a8bb1c4, type: 3}
+--- !u!1 &461712683
+GameObject:
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+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 461712685}
+  - component: {fileID: 461712684}
+  m_Layer: 0
+  m_Name: NavMesh Surface
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!114 &461712684
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+  m_PrefabAsset: {fileID: 0}
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+--- !u!4 &461712685
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+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_ConstrainProportionsScale: 0
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+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!1001 &506206182
 PrefabInstance:
   m_ObjectHideFlags: 0
@@ -2234,3 +2298,4 @@ SceneRoots:
   - {fileID: 923663413}
   - {fileID: 623453700}
   - {fileID: 1722346154}
+  - {fileID: 461712685}

Assets/Scenes/Level3/NavMesh-NavMesh Surface.asset.meta

@@ -0,0 +1,8 @@
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+guid: 3d0e0ff361bcb4e4597cc418078273a1
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Assets/Scripts/Enemies/MeleeEnemy.cs

@@ -1,3 +1,4 @@
+using Unity.AI.Navigation;
 using UnityEngine;
 using UnityEngine.AI;
 
@@ -16,6 +17,10 @@ public class MeleeEnemy : Enemy
     float currentDelay = 0;
 
     void Start() {
+        if (!FindFirstObjectByType<NavMeshSurface>()) {
+            Destroy(gameObject);
+            return;
+        }
         target = FindFirstObjectByType<Player>();
         navMeshAgent = GetComponent<NavMeshAgent>();
         patrollingTarget = GetPatrollingTarget();