diff --git a/src/Bundle/ChillActivityBundle/Form/ActivityType.php b/src/Bundle/ChillActivityBundle/Form/ActivityType.php
index 8578b0a8a..d19f4ce19 100644
--- a/src/Bundle/ChillActivityBundle/Form/ActivityType.php
+++ b/src/Bundle/ChillActivityBundle/Form/ActivityType.php
@@ -266,7 +266,7 @@ class ActivityType extends AbstractType
 
                         return array_map(
                             fn (string $id): ?Person => $this->om->getRepository(Person::class)->findOneBy(['id' => (int) $id]),
-                            explode(',', (string) $personsAsString)
+                            explode(',', $personsAsString)
                         );
                     }
                 ));
@@ -292,7 +292,7 @@ class ActivityType extends AbstractType
 
                         return array_map(
                             fn (string $id): ?ThirdParty => $this->om->getRepository(ThirdParty::class)->findOneBy(['id' => (int) $id]),
-                            explode(',', (string) $thirdpartyAsString)
+                            explode(',', $thirdpartyAsString)
                         );
                     }
                 ));
@@ -329,7 +329,7 @@ class ActivityType extends AbstractType
 
                         return array_map(
                             fn (string $id): ?User => $this->om->getRepository(User::class)->findOneBy(['id' => (int) $id]),
-                            explode(',', (string) $usersAsString)
+                            explode(',', $usersAsString)
                         );
                     }
                 ));