diff --git a/packages/block-library/src/query/block.json b/packages/block-library/src/query/block.json
index ce9def4b028e4c..63d489ad0d5525 100644
--- a/packages/block-library/src/query/block.json
+++ b/packages/block-library/src/query/block.json
@@ -15,7 +15,7 @@
 				"tagIds": [],
 				"order": "desc",
 				"orderBy": "date",
-				"author": null,
+				"author": "",
 				"search": ""
 			}
 		}
diff --git a/packages/e2e-tests/fixtures/blocks/core__query.json b/packages/e2e-tests/fixtures/blocks/core__query.json
index e65ded4c10e43f..c225bc2053ea8a 100644
--- a/packages/e2e-tests/fixtures/blocks/core__query.json
+++ b/packages/e2e-tests/fixtures/blocks/core__query.json
@@ -12,7 +12,7 @@
 				"tagIds": [],
 				"order": "desc",
 				"orderBy": "date",
-				"author": null,
+				"author": "",
 				"search": ""
 			}
 		},