infoWordPress Core•webwordpresshourglass_emptyloading_issuedangerousfatal_errorcodephp_errorfunctionsundefined_function•labelCommon•warningModerate

Call to undefined function wp_get_current_user()

The function wp_get_current_user() lives in wp-includes/pluggable.php. WordPress loads this file during the bootstrap process. If the file is not loaded, the function does not exist and PHP throws a fatal error.

The error appears when core files are missing, corrupted, or unreadable, or when a plugin or theme calls the function before WordPress finishes loading. The call happens early in the execution flow, so the function definition is not yet available.

Symptoms

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White screen of death

A blank page appears on the front‑end or admin area.

[dashicons-warning]

Fatal error message

Browser shows "Call to undefined function wp_get_current_user()".

[dashicons-admin-plugins]

Plugin activation fails

Critical error stops the plugin from activating.

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Login loop

Login page reloads without granting access.

Common Causes

Core file not loaded

wp-includes/pluggable.php is never required during bootstrap.

Early call

Plugin or theme runs code before plugins_loaded or init.

Corrupt installation

Missing or damaged pluggable.php prevents the function from being defined.

File permission issue

Web server lacks read access to core files.

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