Expected error being overwritten by last thrown exception

**Describe the bug**
Occasionally when our application throws an exception, the expected error is replaced by a caught exception that is thrown in the error handler.

A basic example of what I'm seeing is that our application will throw

```
throw new Exception('Cancellation failed. '.$e->getMessage());
```

which Laravel reports to Sentry. Sentry has the correct error but this is the exception reported to ELK:


However, this exception is caught and ignored in `getComposerPackages`.


**To Reproduce**
I've been unable to replicate this outside of our environment. I will create an application with our exact versions and try to replicate it.

**Expected behavior**
The correct exception is reported.