diff --git a/backend/src/main/resources/file-system-metadata-provider.schema.json b/backend/src/main/resources/file-system-metadata-provider.schema.json
index 834c75a3c..cbfec6b8c 100644
--- a/backend/src/main/resources/file-system-metadata-provider.schema.json
+++ b/backend/src/main/resources/file-system-metadata-provider.schema.json
@@ -134,6 +134,7 @@
                         "help": "message.real-number"
                     },
                     "placeholder": "label.real-number",
+                    "default": "",
                     "pattern": "^(?:([0]*(\\.[0-9]+)?|[0]*\\.[0-9]*[1-9][0-9]*)|)$"
                 }
             }