Notice: Undefined variable: episode in /var/www/ on line 93

Notice: Trying to access array offset on value of type null in /var/www/ on line 93
Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?' at line 3
Query: SELECT * FROM authors WHERE id = ?
File:  /var/www/
Line:  93

/var/www/ on line 93
Error selecting database