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Changes between Initial Version and Version 1 of Ticket #51645, comment 1

initial	v1
1	1	Welcome to Trac, @kellybleck! This does indeed look like something that should be investigated.
2	2
3		In 5.~~5, the `$args` parameter was added and made filterable~~. It looks like the filtered `$args` could unset the `echo` property and throw this notice when `if ( $args['echo'] ) {` is run.
	3	In 5.2, the `$args` parameter was added and made filterable with the `search_form_args` filter. It looks like the filtered `$args` could unset the `echo` property and throw this notice when `if ( $args['echo'] ) {` is run.
4	4
5	5	My guess is that a simple `isset` sanity check would work here.