diff --git a/src/lib/serialize.ts b/src/lib/serialize.ts
index ef82067..b32131b 100644
--- a/src/lib/serialize.ts
+++ b/src/lib/serialize.ts
@@ -33,7 +33,7 @@ const nestedUpdateUrlSearchParams = (
     const currentPath = [...path, key]
     if (isPlainObject(value)) {
       nestedUpdateUrlSearchParams(searchParams, value, currentPath)
-      return
+      continue
     }
 
     const name = currentPath.join('.')
diff --git a/test/serialization.test.ts b/test/serialization.test.ts
index 7efb43f..20bfa1d 100644
--- a/test/serialization.test.ts
+++ b/test/serialization.test.ts
@@ -108,6 +108,30 @@ test('serializes plain objects', (t) => {
     }),
     'bar.baz=1&bar.baz=a&foo=1',
   )
+
+  t.is(
+    serializeUrlSearchParams({
+      foo: {},
+      bar: 2,
+    }),
+    'bar=2',
+  )
+
+  t.is(
+    serializeUrlSearchParams({
+      foo: { x: {} },
+      bar: 2,
+    }),
+    'bar=2',
+  )
+
+  t.is(
+    serializeUrlSearchParams({
+      foo: {},
+      bar: { baz: { x: { z: null, t: {} }, q: {} } },
+    }),
+    'bar.baz.x.z=',
+  )
 })
 
 test('cannot serialize keys containing a .', (t) => {