Source .zshrc is restarting my iterm2

I don't know what I've changed but whenever I run the command:

source .zshrc

My iTerm2 restarts itself, and then the changes takes effect. However, it was working fine previously.

Is there a place where I can check my error log for the source command?
Thanks.

EDIT: I've unchecked the option Automatically close a session when it ends in my Profile Settings and when I try to source, it gives me:

================= Broken Pipe =================

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