diff --git a/src/Plugin/Condition/UserHasRole.php b/src/Plugin/Condition/UserHasRole.php
index 357e262..8c0490f 100644
--- a/src/Plugin/Condition/UserHasRole.php
+++ b/src/Plugin/Condition/UserHasRole.php
@@ -4,6 +4,7 @@ namespace Drupal\rules\Plugin\Condition;
 
 use Drupal\rules\Core\RulesConditionBase;
 use Drupal\rules\Exception\InvalidArgumentException;
+use Drupal\user\RoleInterface;
 use Drupal\user\UserInterface;
 use Drupal\user\Entity\Role;
 
@@ -58,21 +59,24 @@ class UserHasRole extends RulesConditionBase {
         $drupal_roles = Role::loadMultiple();
       }
       // If the role is not a role entity yet, load it if we can.
-      if (!$role instanceof Role) {
+      if (!$role instanceof RoleInterface) {
         // Try to load the role by role id.
-        if ($r = Role::load(strtolower($role))) {
+        if ($r = Role::load(strtolower(trim($role)))) {
           $role = $r;
         }
         else {
           // Try to load the role by role label.
           foreach ($drupal_roles as $drupal_role) {
-            if ($drupal_role->get('label') == trim($role)) {
+            if ($drupal_role->get('label') === trim($role)) {
               $role = $drupal_role;
               break;
             }
           }
         }
       }
+      if (!$role instanceof RoleInterface) {
+        throw new \LogicException('Role ' . $role . ' does not exist.');
+      }
       return $role->id();
     }, $roles);