Drush terminated abnormally Drush version 9.7.0 Drush Launch version 0.6.0 Drupal ver 8.7.3 Open social dist 5.5.

The error I get at the command line when running drush topic or drush cr or any Drush command:


  [warning] Drush command terminated abnormally. Check for an exit() in
  your Drupal site.


I have tried reinstalling Drush, removing and reinstalling, clearing cache via the GUI, but nothing seems to help.

I don't know where to check for an "exit() in your Drupal site".
Use an IDE to open your site and search into all your files.

When you find one exit(), comment it and try to use Drush again. Do it until you find the exit() that block Drush.