UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 22): ReferenceError: client is not defined

This error seems to be coming up on every http request I make. I'm not totally sure where it's coming from?

(node:39390) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 22): ReferenceError: client is not defined

Sample of code that seems to be causing it:

try {
    var client = await pool.connect();
    await client.query(queryStatement, queryArgumentsArray);
    res.sendStatus(200);
} catch (e) {
    console.log('Error adding updating subvendor availability data, UPDATE SQL query task', err);
    res.sendStatus(500);
} finally {
    client && client.release && client.release();
}

It first I thought it must be coming from my finally block (maybe client was out of scope), but I added and if statement to explicitly prevent attempting to call client.release if it doesn't exist:

if (client) { client && client.release && client.release() };

I am still getting this error, so I feel like it must be coming from these lines.

var client = await pool.connect();
await client.query(queryStatement, queryArgumentsArray);
res.sendStatus(200);

Am I misunderstanding how to use async? To be clear, the code is functioning ant the http requests are working, my terminal is just getting flooded with these warnings.

via Luke Schlangen