Git Error: "points nowhere"

Whenever I try to run any Git commands, I get the error:
error: refs/remotes/m/f2d704c379fecb5597d0aaab007ee04fc9a83842 points
nowhere!

f2d704c379fecb5597d0aaab007ee04fc9a83842 is the commit ID of a Git tree that
I tried to clone previously. It seems like it is still left in my repository
for some reason.

Any ideas on how to stop this error? Thanks in advance.
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