count(): Parameter must be an array or an object that implements Countable

Make sure you're getting the correct result for $product.

public function softDelete(Products $product)
{
    dd($product);
    // do you get the product?
}

You're using the values from it to delete the other things, so make sure you have a $product->prod_id.

I do get prod_id for example 1 or 2.

dd($product->prod_id);

This is Products.php model:

class Products extends Model
{
    use SoftDeletes;

    protected $primaryKey = 'prod_id';
    protected $guarded = ['prod_id'];
    protected $dates = ['deleted_at'];

    public function productMetas()
{
    return $this->hasMany(ProductsMeta::class, 'prod_id');
}

public function productMainImage()
{
    return $this->hasOne(Images::class, 'img_id', 'prod_main_img');
}

public function reviews()
{
    return $this->hasMany(Reviews::class, 'prod_id');
}

public static function get_featured()
{
    return static::where('prod_featured', 1)->limit('4')->get();
}

public static function checkStockAvailability($prod_id, $amount)
{
    $stock = static::select('prod_stock', 'prod_stockable')->where('prod_id', $prod_id)->first();

    if ($stock->prod_stockable == 0) {
        return true;
    }

    if ($stock->prod_stock < $amount) {
        return false;
    }

    return true;
    }
}

Please check the redirection after the soft deletion. I think that will be the issue.

There is nothing wrong with the back();

There is something wrong these:

 Products::where('prod_id', $product->prod_id)->delete();
    Wishlists::where('prod_id', $product->prod_id)->delete();

check your php version. php 7.2 having incompatible issues.

check it here http://php.net/manual/en/migration72.incompatible.php

@AJITHLAL - Yeah I also first thought of that after Googling the error. However, then I thought that the odds are higher that the actual issue has something to do with the code.

Probably within the Wishlist::where()->delete() statement. @davy_yg can you comment that one out and see if it works. Otherwise, could you post your wishlist model?

@JOHNBRAUN - I think you are right.

Check WHERE the error occurs

I think its more likely that your error is in the original view when you return back and try to show or count something related to the product you just deleted

@SNAPEY - I said the same thing and he responded that is not the error.

Please check the redirection after the soft deletion. I think that will be the issue.

There is nothing wrong with the back();

There is something wrong these:

Products::where('prod_id', $product->prod_id)->delete(); Wishlists::where('prod_id', $product->prod_id)->delete();

I expect we won't hear anything else... thats how @davy_yg rolls. Loads of questions, no outcomes or thanks.