Fatal Error with workflow Plugin

We’re using a plugin on the site called Oasis Workflow Pro and when we click on the Make a Revision button within a post or page, a 500 internal server error appeared in the console window. I took a look at the server error logs and saw that Stream is triggering a fatal error. I’ve included the error log text below. The 500 error no longer appeared in the console window and the Make a Revision button functioned as expected once I disabled Stream.

Thank you!

PHP Fatal error: Uncaught exception ‘Exception’ with message ‘Invalid use, type must be one of INPUT_* family.’ in /nas/content/staging/sitename/wp-content/plugins/stream/classes/class-filter-input.php:51\nStack trace:\n#0 [internal function]: WP_Stream\\Filter_Input::super(0, ‘post_type’)\n#1 /nas/content/staging/sitename/wp-content/plugins/stream/includes/functions.php(16): call_user_func_array(Array, Array)\n#2 /nas/content/staging/sitename/wp-content/plugins/stream/classes/class-alerts-list.php(342): wp_stream_filter_input(0, ‘post_type’)\n#3 [internal function]: WP_Stream\\Alerts_List->save_alert_inline_edit(Array, Array)\n#4 /nas/content/staging/sitename/wp-includes/class-wp-hook.php(298): call_user_func_array(Array, Array)\n#5 /nas/content/staging/sitename/wp-includes/plugin.php(203): WP_Hook->apply_filters(Array, Array)\n#6 /nas/content/staging/sitename/wp-includes/post.php(3281): apply_filters(‘wp_insert_post_…’, Array, Array)\n#7 /nas/content/staging/sitename/wp-content/plugins/oasis-workflow-pro/ in /nas/content/staging/sitename/wp-content/plugins/stream/classes/class-filter-input.php on line 51, referer: https://sitename.staging.wpengine.com/wp-admin/post.php?post=1357&action=edit&lang=en