[Part 2] SerializedObjectNotCreatableException: Object at index 0 is null

[Piskorskee skee]

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Hi everyone!

So I have been watching this tutorial: Creating a Rogue-like (like Vampire Survivors) in Unity — Part 2: Map Generation

And about 25th minute I ran on this bug:

SerializedObjectNotCreatableException: Object at index 0 is null

Below both scripts that I changed and since that time I have this bug (I can still run the game though):

MapController:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MapController : MonoBehaviour
{
public List<GameObject> terrainChunks;
public GameObject player;
public float checkerRadius;
Vector3 noTerrainPosition;
public LayerMask terrainMask;
public GameObject currentChunk;
PlayerMovement pm;

// Start is called once before the first execution of Update after the MonoBehaviour is created
void Start()
{
pm = FindFirstObjectByType<PlayerMovement>();
}

// Update is called once per frame
void Update()
{
ChunkChecker();
}

void ChunkChecker()
{
if (!currentChunk)
{
return;
}

if (pm.moveDir.x > 0 && pm.moveDir.y == 0)
{
if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Right").position, checkerRadius, terrainMask))
{
noTerrainPosition = currentChunk.transform.Find("Right").position;
SpawnChunk();
}
}
else if (pm.moveDir.x < 0 && pm.moveDir.y == 0)
{
if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Left").position, checkerRadius, terrainMask))
{
noTerrainPosition = currentChunk.transform.Find("Left").position;
SpawnChunk();
}
}
else if (pm.moveDir.x == 0 && pm.moveDir.y > 0)
{
if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Up").position, checkerRadius, terrainMask))
{
noTerrainPosition = currentChunk.transform.Find("Up").position;
SpawnChunk();
}
}
else if (pm.moveDir.x == 0 && pm.moveDir.y < 0)
{
if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Down").position, checkerRadius, terrainMask))
{
noTerrainPosition = currentChunk.transform.Find("Down").position;
SpawnChunk();
}
}
else if (pm.moveDir.x > 0 && pm.moveDir.y > 0)
{
if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Right Up").position, checkerRadius, terrainMask))
{
noTerrainPosition = currentChunk.transform.Find("Right Up").position;
SpawnChunk();
}
}
else if (pm.moveDir.x > 0 && pm.moveDir.y < 0)
{
if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Right Down").position, checkerRadius, terrainMask))
{
noTerrainPosition = currentChunk.transform.Find("Right Down").position;
SpawnChunk();
}
}
else if (pm.moveDir.x < 0 && pm.moveDir.y > 0)
{
if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Left Up").position, checkerRadius, terrainMask))
{
noTerrainPosition = currentChunk.transform.Find("Left Up").position;
SpawnChunk();
}
}
else if (pm.moveDir.x < 0 && pm.moveDir.y < 0)
{
if (!Physics2D.OverlapCircle(currentChunk.transform.Find("Left Down").position, checkerRadius, terrainMask))
{
noTerrainPosition = currentChunk.transform.Find("Left Down").position;
SpawnChunk();
}
}
}
void SpawnChunk()
{
int rand = Random.Range(0, terrainChunks.Count);
Instantiate(terrainChunks[rand], noTerrainPosition, Quaternion.identity);
}
}

ChunkTrigger:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ChunkTrigger : MonoBehaviour
{
MapController mc;

public GameObject targetMap;

void Start()
{
mc = FindFirstObjectByType<MapController>();
}

private void OnTriggerStay2D(Collider2D col)
{
if (col.CompareTag("Player"))
{
mc.currentChunk = targetMap;
}
}

private void OnTriggerExit2D(Collider2D col)
{
if (col.CompareTag("Player"))
{
if (mc.currentChunk == targetMap)
{
mc.currentChunk = null;
}
}
}
}

I have had to use FindFirstObjectByType as I’m using Unity 6

Would you be able to help me spot the bug or do you need any other information? Thanks!

[Piskorskee skee]

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Okay nvm, I just restarted Unity and no bugs anymore :P

• Terence

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[Terence]

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@piskorskeeskee glad you managed to fix your issue. Any errors with serialized objects are more likely than not issues with the editor that can be fixed by closing and reopening.

[Alp Apustaja]

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It sounds like restarting Unity resolved the issues you were experiencing! This is a common solution for various bugs and glitches in development environments. If you run into any other problems or have specific questions about your project, feel free to ask! Happy developing!

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