diff --git a/src/Bundle/ChillActivityBundle/Entity/Activity.php b/src/Bundle/ChillActivityBundle/Entity/Activity.php
index fbd10e723..549f800a2 100644
--- a/src/Bundle/ChillActivityBundle/Entity/Activity.php
+++ b/src/Bundle/ChillActivityBundle/Entity/Activity.php
@@ -282,7 +282,7 @@ class Activity implements HasCenterInterface, HasScopeInterface
         return $this->socialIssues;
     }
 
-    public function addSocialIssue(?SocialIssue $socialIssue): self
+    public function addSocialIssue(SocialIssue $socialIssue): self
     {
         if (!$this->socialIssues->contains($socialIssue)) {
             $this->socialIssues[] = $socialIssue;
@@ -303,7 +303,7 @@ class Activity implements HasCenterInterface, HasScopeInterface
         return $this->socialActions;
     }
 
-    public function addSocialAction(?SocialAction $socialAction): self
+    public function addSocialAction(SocialAction $socialAction): self
     {
         if (!$this->socialActions->contains($socialAction)) {
             $this->socialActions[] = $socialAction;