@@ -123,6 +123,11 @@ private function __construct() {
 				define( 'CMB2_LOADED', self::PRIORITY );
 			}
 
+			if ( ! function_exists( 'add_action' ) ) {
+				// We are running outside of the context of WordPress.
+				return;
+			}
+
 			add_action( 'init', array( $this, 'include_cmb' ), self::PRIORITY );
 		}
Original file line number	Diff line number	Diff line change
`@@ -123,6 +123,11 @@ private function __construct() {`
`123`	`123`	`define( 'CMB2_LOADED', self::PRIORITY );`
`124`	`124`	`}`
`125`	`125`
	`126`	`+ if ( ! function_exists( 'add_action' ) ) {`
	`127`	`+ // We are running outside of the context of WordPress.`
	`128`	`+ return;`
	`129`	`+ }`
	`130`	`+`
`126`	`131`	`add_action( 'init', array( $this, 'include_cmb' ), self::PRIORITY );`
`127`	`132`	`}`
`128`	`133`