diff --git a/Falcon.SugarApi/DatabaseDefinitions/SugarDbContext.cs b/Falcon.SugarApi/DatabaseDefinitions/SugarDbContext.cs
index c312744..4154946 100644
--- a/Falcon.SugarApi/DatabaseDefinitions/SugarDbContext.cs
+++ b/Falcon.SugarApi/DatabaseDefinitions/SugarDbContext.cs
@@ -154,7 +154,9 @@ namespace Falcon.SugarApi.DatabaseDefinitions
                 var type = types[i];
                 if (!InitdTable.Any(m => m == type.FullName)) {
                     this.CodeFirst.BackupTable().SetStringDefaultLength(200).InitTables(type);
-                    InitdTable.Add(type.FullName);
+                    if (type.FullName != null) {
+                        InitdTable.Add(type.FullName);
+                    }
                 }
             }