diff --git a/src/Our.Umbraco.LinkedPages/Controllers/LinkedPagesApiController.cs b/src/Our.Umbraco.LinkedPages/Controllers/LinkedPagesApiController.cs
index 9b54ca3..1d4cab5 100644
--- a/src/Our.Umbraco.LinkedPages/Controllers/LinkedPagesApiController.cs
+++ b/src/Our.Umbraco.LinkedPages/Controllers/LinkedPagesApiController.cs
@@ -80,7 +80,8 @@ public IEnumerable<LinkedPageInfo> CreateLink(int parent, int child)
 
         if (parentNode == null || childNode == null)
             throw new KeyNotFoundException();
-        var typeAlias = _config.RelationType ?? defaultRelationType;
+        var typeAlias = string.IsNullOrWhiteSpace(_config.RelationType) ?
+                defaultRelationType : _config.RelationType;
         var relationType = _relationService.GetRelationTypeByAlias(typeAlias);
         if (relationType == null)
             throw new ApplicationException($"Cannot create relation of type {typeAlias}");