diff --git a/library/Icingadb/Model/DependencyEdge.php b/library/Icingadb/Model/DependencyEdge.php
index 7674ce3ed..fdf299595 100644
--- a/library/Icingadb/Model/DependencyEdge.php
+++ b/library/Icingadb/Model/DependencyEdge.php
@@ -62,8 +62,11 @@ public function createRelations(Relations $relations): void
 
         // "from" and "to" are only necessary for sub-query filters.
         $relations->belongsTo('from', DependencyNode::class)
-            ->setCandidateKey('from_node_id');
+            ->setCandidateKey('from_node_id')
+            ->setJoinType('LEFT');
+
         $relations->belongsTo('to', DependencyNode::class)
-            ->setCandidateKey('to_node_id');
+            ->setCandidateKey('to_node_id')
+            ->setJoinType('LEFT');
     }
 }
diff --git a/library/Icingadb/Model/RedundancyGroup.php b/library/Icingadb/Model/RedundancyGroup.php
index d4e20140d..a2aa05030 100644
--- a/library/Icingadb/Model/RedundancyGroup.php
+++ b/library/Icingadb/Model/RedundancyGroup.php
@@ -21,8 +21,8 @@
  *
  * @property (?RedundancyGroupState)|Query $state
  * @property Dependency|Query $dependency
- * @property DependencyEdge|Query $from
- * @property DependencyEdge|Query $to
+ * @property (?DependencyEdge)|Query $from
+ * @property (?DependencyEdge)|Query $to
  */
 class RedundancyGroup extends Model
 {
@@ -65,10 +65,13 @@ public function createRelations(Relations $relations): void
         $relations->belongsToMany('from', DependencyEdge::class)
             ->setTargetCandidateKey('from_node_id')
             ->setTargetForeignKey('id')
-            ->through(DependencyNode::class);
+            ->through(DependencyNode::class)
+            ->setJoinType('LEFT');
+
         $relations->belongsToMany('to', DependencyEdge::class)
             ->setTargetCandidateKey('to_node_id')
             ->setTargetForeignKey('id')
-            ->through(DependencyNode::class);
+            ->through(DependencyNode::class)
+            ->setJoinType('LEFT');
     }
 }