Index: src/wp-admin/includes/class-wp-plugin-install-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-plugin-install-list-table.php	(revision 34246)
+++ src/wp-admin/includes/class-wp-plugin-install-list-table.php	(working copy)
@@ -41,13 +41,17 @@
 		$plugin_info = get_site_transient( 'update_plugins' );
 		if ( isset( $plugin_info->no_update ) ) {
 			foreach ( $plugin_info->no_update as $plugin ) {
-				$slugs[] = $plugin->slug;
+				if ( isset( $plugin->slug ) ) {
+					$slugs[] = $plugin->slug;
+				}
 			}
 		}
 
 		if ( isset( $plugin_info->response ) ) {
 			foreach ( $plugin_info->response as $plugin ) {
-				$slugs[] = $plugin->slug;
+				if ( isset( $plugin->slug ) ) {
+					$slugs[] = $plugin->slug;
+				}
 			}
 		}