Framework repeatingly sending messages to Facebook Messenger

I've got the following problem: In some cases the framework does not stop sending messages to the Facebook messenger for some User. I know this problem, if there is an error in the code.

We could not find the problem during testing. I assumed the problem occurs if the user denies access to some information or tries to ignore the bot.

The Version in which the Problem was occuring was:

Laravel Framework 5.6.39
Botman Version 2.4.1

Facebook Driver
"name": "botman/driver-facebook",
"url": "https://github.com/botman/driver-facebook.git",
"url": "https://api.github.com/repos/botman/driver-facebook/zipball/8071f777388de7cde8122a340acdab01694d517b",
"homepage": "http://github.com/botman/driver-facebook",
"facebook",
"facebook messenger"
"botman/driver-facebook": "dev-master" (2.0-dev)

We have done an update to the system, the current version in test is:

Laravel Framework 5.6.39
Botman Version 2.5.0

Facebook Driver
"name": "botman/driver-facebook",
"version": "1.10.0",
"source": {
"type": "git",
"url": "https://github.com/botman/driver-facebook.git",
"reference": "a02096c5b9dafddc3353e8c5eff060fcb004985f"

If it is possible to get a hint for the cause of the problem it would be great.

Also if there is a setting to stop botman to repeatingly sending the same message over and over again this would be got to know.