array_flip():Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load()

Here is simple solution :)

Edit `settings.php` file and add this line

error_reporting(0);

I've also gotten this message when erroneously trying to load multiple nodes via node_load_multiple($nids) where $nids was not an array of node-ids.

For example, using the result of an EntityFieldQuery, and calling node_load_multiple($result['node']) instead of node_load_multiple(array_keys($result['node'])).

**When such errors occur on the Drupal, my suggestion is to check firstly the "Recent log messages" list** in the Admin panel:

[![enter image description here][1]][1]

This page has been very helpful to me many times.

**Tip:** Sometimes it makes sense to look at not only the last **Error** but also the **Warning** and **Notice** messages that immediately precede it. **Details** of one of them usually contain a significant hint to solve the problem.

[1]:

You can clean the array from null values before flipping

Like this

```php
$my_array = array_filter($my_array);
$my_array = array_flip($my_array);
```