Weird Script Code

Hello. I’m having some weird issue.
Every time I start up a studio file. There’s always one line of code in the ServerScriptService that has a line pasted in front of the first function in the script. I don’t know what it is or why it just keeps doing that.
Can someone explain?

this is a backdoor please delete this script!

How is it even getting there?

Have you inserted a free model in recently in that game. If so that could be causing it.

Only thing I inserted was some mesh parts to build with.

Please follow category guidelines when posting:
https://devforum.roblox.com/t/about-the-scripting-support-category/45863

Be extremely clear and show code / pictures where relevant.

For your specific issue please search for similar posts on the forum that talk about backdoor scripts. No need to post about this again.