Ensure that saving does not happen during a switch-to-blog session, a…

…s data would be saved to the wrong object.

CHANGELOG.md

@@ -16,6 +16,7 @@ All notable changes to this project will be documented in this file.
 * Make wysiwyg editors work in the repeatable groups context. A standard repeatable (non-group) wysiwyg field is not supported (but will possibly be included in a future update). Props [@johnsonpaul1014](https://github.com/johnsonpaul1014) ([#26](https://github.com/WebDevStudios/CMB2/pull/26), [#99](https://github.com/WebDevStudios/CMB2/pull/99), [#260](https://github.com/WebDevStudios/CMB2/pull/260), [#264](https://github.com/WebDevStudios/CMB2/pull/264), [#356](https://github.com/WebDevStudios/CMB2/pull/356), [#431](https://github.com/WebDevStudios/CMB2/pull/431), [#462](https://github.com/WebDevStudios/CMB2/pull/462), [#657](https://github.com/WebDevStudios/CMB2/pull/657), [#693](https://github.com/WebDevStudios/CMB2/pull/693)). 
 * Add an id to the heading tag in the title field. This allows linking to a particular title using the id.
 * Internationalization improvements. Props [ramiy](https://github.com/ramiy) ([#696](https://github.com/WebDevStudios/CMB2/pull/696)).
+* Ensure that saving does not happen during a switch-to-blog session, as data would be saved to the wrong object. [See more](https://wordpress.org/support/topic/bug-in-lastest-version?replies=2).
 
 
 ### Bug Fixes

includes/CMB2_hookup.php

@@ -572,7 +572,7 @@ public function delete_term( $term_id, $tt_id, $taxonomy = '' ) {
 	 * @return bool          Whether object can be saved
 	 */
 	public function can_save( $type = '' ) {
-		return (
+		return apply_filters( 'cmb2_can_save', (
 			$this->cmb->prop( 'save_fields' )
 			// check nonce
 			&& isset( $_POST[ $this->cmb->nonce() ] )
@@ -581,7 +581,9 @@ public function can_save( $type = '' ) {
 			&& ! ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
 			// get the metabox types & compare it to this type
 			&& ( $type && in_array( $type, $this->cmb->prop( 'object_types' ) ) )
-		);
+			// Don't do updates during a switch-to-blog instance.
+			&& ! ( is_multisite() && ms_is_switched() )
+		) );
 	}
 
 	/**