[E_DEPRECATED] ltrim(): Passing null to parameter #1 ($string) of type string is deprecated

[Robert9]

Very strange ... I am working on an add-on; no errors.
Then I did a copy to make a smaller version and deleted some classes,
suddenly I have this error.

Template public:xc_links1_post_macros: [E_DEPRECATED] ltrim(): Passing null to parameter #1 ($string) of type string is deprecated (src/XF/Template/Templater.php:1880)

What can I do to find the problem?

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