EM_Booking#get() - wrong table usage

[XedinUnknown]

The Problem

When using EM_Booking#get(), an SQL error is thrown.

Possible Cause

get() tries to retrieve the table name from $wpdb:

$sql = "SELECT * FROM ". $wpdb->EM_BOOKINGS_TABLE ." WHERE " . implode(' AND ', $conds);

That results in a query like the following:

SELECT * FROM  WHERE 1

That's because there's no such thing as $wpdb->EM_BOOKINGS_TABLE.

Suggested Solution

Use constants, the same way as everywhere else in the plugin:

$sql = "SELECT * FROM ". EM_BOOKINGS_TABLE ." WHERE " . implode(' AND ', $conds);

Remarks

I am aware that this repo has not been updated in a long time. However, the problem still presents on 5.9.x: see trac.