diff --git a/src/Bundle/ChillPersonBundle/Validator/Constraints/AccompanyingPeriod/AccompanyingPeriodValidityValidator.php b/src/Bundle/ChillPersonBundle/Validator/Constraints/AccompanyingPeriod/AccompanyingPeriodValidityValidator.php
index 51462c56e..9454d31d0 100644
--- a/src/Bundle/ChillPersonBundle/Validator/Constraints/AccompanyingPeriod/AccompanyingPeriodValidityValidator.php
+++ b/src/Bundle/ChillPersonBundle/Validator/Constraints/AccompanyingPeriod/AccompanyingPeriodValidityValidator.php
@@ -54,7 +54,7 @@ class AccompanyingPeriodValidityValidator extends ConstraintValidator
         $activities = $this->activityRepository->findBy(['accompanyingPeriod' => $period]);
 
         foreach ($activities as $activity) {
-            $socialIssues = $activity->getSocialIssues()->toArray();
+            $socialIssues = array_merge($socialIssues, $activity->getSocialIssues()->toArray());
         }
 
         foreach ($period->getWorks() as $work) {
@@ -64,7 +64,7 @@ class AccompanyingPeriodValidityValidator extends ConstraintValidator
         $socialIssuesByKey = [];
 
         foreach ($socialIssues as $si) {
-            $socialIssuesByKey[$si->getId()] = $si;
+            $socialIssuesByKey[spl_object_hash($si)] = $si;
         }
 
         $periodIssuesWithAncestors = [];
@@ -75,7 +75,7 @@ class AccompanyingPeriodValidityValidator extends ConstraintValidator
                 $periodIssuesWithAncestors,
                 array_map(
                     static function (SocialIssue $si) {
-                        return $si->getId();
+                        return spl_object_hash($si);
                     },
                     $si->getAncestors(true)
                 )