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Editorial Team
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Asked: 2026-06-16T09:07:19+00:00

Recently, I often encounter errors like this: Debugger entered–Lisp error: (wrong-type-argument number-or-marker-p nil) I

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Recently, I often encounter errors like this:

Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p nil)

I found that in some situations, the error is caused by expressions like this:

(= nil 4)

I’m not sure whether this expression is intended to write like this, but it will work only if I change it to:

(eq nil 4)

However, (1) I need to replace all = to eq in that emacs lisp script (2) I’m not sure the codes should be modified like this.

I was wondering that whether I can write a few lines in the config file (.emacs) instead of modify on the source code to get things done. Does anyone have ideas about this?

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1 Answer

  1. Editorial Team

    Don’t do this.

    You’re going down the path of hiding errors in code. Figure out the root
    cause of why you’re passing nil to = and fix that.

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