[Error Message] Problem Sending Message to the user UID 1

[flAming]

Hi,


The Problem

When any member tries to send a Private Message to the user with UID 1, it shows this error: http://prnt.sc/eu94jx
I am using the UID 1. It is the super admin account as well.

The Forum Link
http://infinitybb.net/

I am running the MyBB version 1.8.10. If anyone requires a Test account, post below. 
Your kind help and co-operation is greatly appreciated. Thank you.

[.m.]

username of uid 1 has a special character at the end (space ?) - above referred issue should be fixed by removing that character

[flAming]

username of uid 1 has a special character at the end (space ?) - above referred issue should be fixed by removing that character

Hi, thank you so much. That worked! This can be closed now.