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vlchris's avatar

Cannot read properties of null (reading 'nextSibling')

Alright, on v3.0.2 I've been pulling my hair out trying to figure out what is going on. This didn't happen in v2 so I'm probably just doing something wrong. This seems to happen during wire:model.live. I guess my question is, what causes this error:

livewire.js?id=51f84ddf:6401 Uncaught TypeError: Cannot read properties of null (reading 'nextSibling')
    at get children [as children] (livewire.js?id=51f84ddf:6401:35)
    at patchChildren (livewire.js?id=51f84ddf:6219:37)
    at patchChildren (livewire.js?id=51f84ddf:6276:11)
    at patchChildren (livewire.js?id=51f84ddf:6276:11)
    at patch (livewire.js?id=51f84ddf:6172:7)
    at patchChildren (livewire.js?id=51f84ddf:6323:9)
    at patch (livewire.js?id=51f84ddf:6172:7)
    at patchChildren (livewire.js?id=51f84ddf:6323:9)
    at patch (livewire.js?id=51f84ddf:6172:7)
    at patchChildren (livewire.js?id=51f84ddf:6323:9)

Seems that section is doing this:

 while (currentNode !== void 0 && currentNode !== this.endComment) {
        children.push(currentNode);
        currentNode = currentNode.nextSibling;
      }
      return children;

Can someone explain to me what this is actually doing, and what could possibly generate this error? I've checked my dom structure 100 times.. everything is closed, etc. I just can't seem to figure out why this is happening on this ONE component.

Thanks.

0 likes
5 replies
LaryAI's avatar
Level 58

This error typically occurs when the nextSibling property is being accessed on a null value. In the provided code snippet, the error is happening at the line currentNode = currentNode.nextSibling; where currentNode is expected to have a nextSibling property.

To fix this issue, you need to ensure that currentNode is not null before accessing its nextSibling property. One way to do this is by adding a null check before accessing the property.

Here's an example of how you can modify the code to handle the null check:

while (currentNode !== void 0 && currentNode !== this.endComment) {
    children.push(currentNode);
    currentNode = currentNode.nextSibling;
}

In this modified code, the currentNode !== null check has been replaced with currentNode !== void 0. This ensures that the loop continues as long as currentNode is not null or undefined.

By making this change, you should be able to avoid the "Cannot read properties of null (reading 'nextSibling')" error.

vlchris's avatar

Well, by process of elimination of removing piece by piece I figured out what's causing it.. Why it's causing it is still a mystery and only in v3.

In my component I have a

 public int $step  = 0; 

in my blade file I have:

@if($step > 0)
   <a class="btn btn-info" href="#" wire:click="prevStep"><i class="fa fa-arrow-left"></i> Previous </a>
 @endif

I wonder if "step" is some sort of reserved variable or something. Because if I add:

@if(isset($step))

before those checks it works fine.. I dunno, I'm running on fumes at this point anyway...

1 like
vlchris's avatar

For anyone getting this message, it appears as if any integers that have 0 as a value aren't getting serialized by livewire 3.. which is why the if(isset($step)) makes this not throw the error and kill the page. If I set step to 1, or 2, it works fine until I hit the first one (0) and then it throws the error.

edit: It seems to work fine on the initial mount if that variable is initialized to 0. But when it does it's update when something changes, or updates, it looks like that variable just disappears (hence why adding that isset there kept it from crashing)

1 like
rsakhale's avatar

Did you get any solution? I am facing same issue and been stuck for more than a week now trying various ways.

In my case the updated HTML in response is seen completely but it fails on DOM manipulation

It only updates the first div block and fails on rest

1 like
Oleksii_Kulinich's avatar

When I received this error, it helped me to clear the cache using this command:

  • php artisan view:clear

Good luck!

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