PHP error when saving config changes

I just upgraded to v5.1.3 Now when I try to save a config change (even if there are no actual changes) I get the following PHP code error:

( ! ) Warning: strip_tags() expects parameter 1 to be string, array given in /Volumes/hd/userdata/david/Sites/wlivingstone/first-for-seat-cars/www/wp-content/plugins/google-analytics-for-wordpress/admin/class-admin.php on line 88
Call Stack
# Time Memory Function Location
1 0.0024 313240 {main}( ) ../admin.php:0
2 1.0202 40897256 do_action( ) ../admin.php:145
3 1.0435 41613008 call_user_func_array:{/Volumes/hd/userdata/david/Sites/wlivingstone/first-for-seat-cars/www/wp-includes/plugin.php:505} ( ) ../plugin.php:505
4 1.0435 41613040 Yoast_GA_Admin->init_settings( ) ../plugin.php:505
5 1.0438 41613672 Yoast_GA_Admin->save_settings( ) ../class-admin.php:60
6 1.0439 41615920 strip_tags ( ) ../class-admin.php:88

print_r of $value on that line returns:

a91931d8291XX-XXXXXX111eventdomainSave changesArray ( )

Any ideas?

db

https://www.ads-software.com/plugins/google-analytics-for-wordpress/