1 files changed, 3 insertions, 0 deletions

diff --git a/vendor/github.com/hashicorp/terraform/helper/schema/field_reader_config.go b/vendor/github.com/hashicorp/terraform/helper/schema/field_reader_config.go
index 808375c..6ad3f13 100644
--- a/vendor/github.com/hashicorp/terraform/helper/schema/field_reader_config.go
+++ b/vendor/github.com/hashicorp/terraform/helper/schema/field_reader_config.go
@@ -219,6 +219,9 @@ func (r *ConfigFieldReader) readMap(k string, schema *Schema) (FieldReadResult,
                         v, _ := r.Config.Get(key)
                         result[ik] = v
                 }
+        case nil:
+                // the map may have been empty on the configuration, so we leave the
+                // empty result
         default:
                 panic(fmt.Sprintf("unknown type: %#v", mraw))
         }