I have a Looker Studio custom connector written in Google AppsScript. In the connector, I am using the LockService’s tryLock(), hasLock(), and releaseLock() functions to prevent concurrent execution of a section of code. Most of the time it works fine, but sometimes I get an error like this:

Exception: We're sorry, a server error occurred. Please wait a bit and try again.

The stack trace shows that the error always comes on the lines where the lock functions are called.

I am initializing the lock globally like this:

var lock = LockService.getScriptLock();

and then using the functions like this:

function execute(request) {
    try {
        lock.tryLock(100);
        if(lock.hasLock()) {
            // custom code
            lock.releaseLock(); 
        }
    }
    catch(e) {
        console.error(e)
    }
    finally {
        if(lock.hasLock()) {
            lock.releaseLock();
        }
    }
}