The /title command treats an invalid second argument as "title". Expected would be that it shows an error message stating that the argument is not valid.
Use the following command
/title @p invalidArgument ["Title"]
Status:Fixed
Reporter:Marcono1234
Created:2017-03-22, 07:17 PM
Updated:2017-11-25, 04:21 AM
Resolved:2017-11-13, 12:46 AM
Votes:2
Watchers:1
Confirmation Status:Confirmed
Labels:/title, argument, command
Affects Versions:Minecraft 1.11.2 - Minecraft 17w43bMinecraft 1.11.2, Minecraft 17w06a, Minecraft 1.12.1, Minecraft 1.12.2, Minecraft 17w43a, Minecraft 17w43b
Fix Versions:Minecraft 17w45b