diff --git a/src/datapage.js b/src/datapage.js
index a3eb672..4613b22 100644
--- a/src/datapage.js
+++ b/src/datapage.js
@@ -193,7 +193,7 @@ export function assembleObjects(
   const assign = []
 
   for (let counter = 0; counter < repetitionLevels.length; counter++) {
-    const def = definitionLevels ? definitionLevels[counter] : maxDefinitionLevel
+    const def = definitionLevels?.length ? definitionLevels[counter] : maxDefinitionLevel
     const rep = repetitionLevels[counter]
 
     if (!rep) {
diff --git a/test/files/nonnullable.impala.json b/test/files/nonnullable.impala.json
index 9e8379d..1b4f003 100644
--- a/test/files/nonnullable.impala.json
+++ b/test/files/nonnullable.impala.json
@@ -1,31 +1,14 @@
 [
   [
     8,
-    [],
-    [
-      -1,
-      -2,
-      null
-    ],
-    [],
-    [],
-    [
-      null,
-      "k1",
-      null,
-      null
-    ],
-    [
-      null,
-      1,
-      null,
-      null
-    ],
+    [-1],
+    [-1, -2, null],
+    { "k1": -1 },
+    { "k1": 1 },
     -1,
-    [],
-    [],
-    [],
-    [],
+    [-1],
+    [-1],
+    ["nonnullable"],
     []
   ]
 ]
diff --git a/test/read.test.js b/test/read.test.js
index fe10a25..5e5bd05 100644
--- a/test/read.test.js
+++ b/test/read.test.js
@@ -17,7 +17,7 @@ const compressors = {
 }
 
 describe('parquetRead', () => {
-  const files = fs.readdirSync('test/files').filter(f => f.endsWith('Int_Map.parquet'))
+  const files = fs.readdirSync('test/files').filter(f => f.endsWith('.parquet'))
 
   files.forEach(file => {
     it(`should parse data from ${file}`, async () => {