PHP stopped execution because the allocated memory was exceeded while Elementor was initializing. The process tried to allocate more bytes than the server allowed.
Elementor loads a large number of scripts, styles, and widget data. Each widget, template, and third‑party add‑on adds to the memory footprint. When the PHP memory_limit setting is lower than the required amount, the fatal error appears.
The result is a blank editor, an endless loading spinner, or a complete site crash. You see the error in logs and often a white screen on the front end.