diff --git a/resources/RemoveInactiveUsersRunner.php b/resources/RemoveInactiveUsersRunner.php
index 7b4aa313e..4f3ba2cbb 100644
--- a/resources/RemoveInactiveUsersRunner.php
+++ b/resources/RemoveInactiveUsersRunner.php
@@ -47,6 +47,13 @@
 
     $lastLoginDate = $user->getLastLoginDate();
 
+    if (!$user->getAPIAuthenticationEntities()->isEmpty()) {
+       // Prevent creating orphaned API credentials.
+       echo "Cannot delete a user with attached API credentials.\n";
+       // Move onto the next users.
+       continue;
+    }
+
     if ($lastLoginDate) { // null lastLoginDate check
         $interval = $today->diff($lastLoginDate);
     } else { // This might only be run once, since new users always have field filled.