Update SaveRelationsBehavior.php

src/SaveRelationsBehavior.php

@@ -86,6 +86,9 @@ class SaveRelationsBehavior extends Behavior
             }
             if ($relation->multiple === true) {
                 $newRelations = [];
+                if(!is_array($value)){
+                    $value = [];
+                }
                 foreach ($value as $entry) {
                     if ($entry instanceof $relation->modelClass) {
                         $newRelations[] = $entry;