Update: Trying the example I gave above doesn't cause any more issues, however I managed to re-create with the command below: https://hatebin.com/mkkmhmipym
The console only outputs one message, it being
[16:09:25 INFO]: [@: Gave 1 [Stone] to Klyser8]
No, I am using it in a command block as the command is too long to be used in chat.
Update: Trying the example I gave above doesn't cause any more issues, however I managed to re-create with the command below: https://hatebin.com/mkkmhmipym
The console only outputs one message, it being
[16:09:25 INFO]: [@: Gave 1 [Stone] to Klyser8]