The FD we were waiting for has something waiting. Waitfordigit returning numeric 1

Hi, I’m new!
I have a script using a personal agi for calls and it has always worked very well for me, I have tested it on 60 servers and everything is fine.
But one day I installed it in an elastix 2.5, asterisk 11.18 and I got the following problem.

[2018-02-26 11:58:41] WARNING[9768][C-000002b6]: channel.c:3662 ast_waitfordigit_full: The FD we were waiting for has something waiting. Waitfordigit returning numeric 1

Then I run tests on asterisk 11.25, asterisk 1.8.20.0 and I have not had any problems, I’m also testing with 11.17.

I have never had problems similar to this one, I have researched here and in other places but I do not find the specific thing.
Only this error has happened to me right here, never before,

With such an old version of Asterisk it’s unlikely anyone would recall or have any insight into that.

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