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並前往https://laracasts.com/discuss/channels/laravel/fatal-error-uncaught-typeerror-mb-strpos-argument-1-haystack-must-be-of-type-string-null-given

Argument #1 ($haystack) must be of type string, null given

Fatal error: Uncaught TypeError: mb_strpos(): Argument #1 ($haystack) must be of ... \laravel\framework\src\Illuminate\Support\Str.php(183): mb_strpos(NULL, ...

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