diff --git a/lib/classes/JsonApi/Routes/Courseware/Rel/BlocksEditBlocker.php b/lib/classes/JsonApi/Routes/Courseware/Rel/BlocksEditBlocker.php
index 20cdf0c020e0e36154aa2e6d3c0d3756037ccdb0..718df724606d80879dde57b9997e83275cda44d0 100644
--- a/lib/classes/JsonApi/Routes/Courseware/Rel/BlocksEditBlocker.php
+++ b/lib/classes/JsonApi/Routes/Courseware/Rel/BlocksEditBlocker.php
@@ -39,7 +39,7 @@ class BlocksEditBlocker extends RelationshipsController
             }
         }
 
-        $related->edit_blocker_id = $editor->id;
+        $related->edit_blocker_id = $editor->id ?? null;
         $related->store();
 
         return $this->getCodeResponse(204);
diff --git a/lib/classes/JsonApi/Routes/Courseware/Rel/ContainersEditBlocker.php b/lib/classes/JsonApi/Routes/Courseware/Rel/ContainersEditBlocker.php
index 1c90822edfeadb3e94d4ac2fda78a442bbd83b69..e4d0a2989511cf865f777dfe19eb155deed024be 100644
--- a/lib/classes/JsonApi/Routes/Courseware/Rel/ContainersEditBlocker.php
+++ b/lib/classes/JsonApi/Routes/Courseware/Rel/ContainersEditBlocker.php
@@ -39,7 +39,7 @@ class ContainersEditBlocker extends RelationshipsController
             }
         }
 
-        $related->edit_blocker_id = $editor->id;
+        $related->edit_blocker_id = $editor->id ?? null;
         $related->store();
 
         return $this->getCodeResponse(204);
diff --git a/lib/classes/JsonApi/Routes/Courseware/Rel/StructuralElementsEditBlocker.php b/lib/classes/JsonApi/Routes/Courseware/Rel/StructuralElementsEditBlocker.php
index 60f60fb680c5a68431ab43f4154c6773c42c9373..3c2780fde7233f9626c7f8e64c0ccad929922fd6 100644
--- a/lib/classes/JsonApi/Routes/Courseware/Rel/StructuralElementsEditBlocker.php
+++ b/lib/classes/JsonApi/Routes/Courseware/Rel/StructuralElementsEditBlocker.php
@@ -39,7 +39,7 @@ class StructuralElementsEditBlocker extends RelationshipsController
             }
         }
 
-        $related->edit_blocker_id = $editor->id;
+        $related->edit_blocker_id = $editor->id ?? null;
         $related->store();
 
         return $this->getCodeResponse(204);