Describe the issue

I built polybar right after forking and cloning the repo. Now it doesn't start and in the log says [read below].

Expected behavior:
Polybar should start.

Actual behavior:
Polybar doesn't start.

Was it working before?
I downloaded, some days ago, the latest release (with sha256sum: 4d22c977969a561f561fdc7a609073854d8fea8a9eec6941e12a80457edcb63a) and building with that it was working.
Also with the AUR stable version (the one I use daily) it was working.

To Reproduce

Clone the repo with git clone --recursive https://github.com/polybar/polybar, and build with:

mkdir build
cd build
cmake ..
make -j$(nproc)
# Optional. This will install the polybar executable in /usr/local/bin
sudo make install

(from the wiki)

Polybar Log

Post everything polybar outputs to the terminal when you run it and the issue occurs below

---
polybar|notice:  Parsing config file: /home/koraynilay/.config/polybar/config
polybar|error: /home/koraynilay/.config/polybar/config:1: Key name '<feff>;' is empty or contains forbidden characters.
---

Environment:

• WM: i3
• Distro: Arch Linux
• Output of polybar -vvv:

polybar 3.4.0-96-gfc42da8-dev

Features: +alsa +curl +i3 +mpd +network(libnl) +pulseaudio +xkeyboard

X extensions: +randr (+monitors) +composite +xkb +xrm +xcursor

Build type: Release
Compiler: /usr/bin/c++
Compiler flags:  -Wall -Wextra -Wpedantic -O3 -DNDEBUG
Linker flags: 

Additional context

I did a bit of research, and 0xFEFF is the Byte Order Mark. So there could be a problem while reading the encoding.