diff --git a/src/file.js b/src/file.js
index 9f76fb3b..07a8aee8 100644
--- a/src/file.js
+++ b/src/file.js
@@ -62,7 +62,9 @@ export function normalizePath(str) {
  * @returns {boolean} True if the path is remote
  */
 export function isRemote(href) {
-  return !Buffer.isBuffer(href) && /(^\/\/)|(:\/\/)/.test(href) && !href.startsWith('file:');
+  return (
+    typeof href === 'string' && !Buffer.isBuffer(href) && /(^\/\/)|(:\/\/)/.test(href) && !href.startsWith('file:')
+  );
 }
 
 /**
@@ -88,8 +90,8 @@ export function urlParse(str = '') {
  * @returns {string} file uri
  */
 function getFileUri(file) {
-  if (!isAbsolute) {
-    throw new Error('Path must be absolute to compute file uri');
+  if (!isAbsolute(file)) {
+    throw new Error('Path must be absolute to compute file uri. Received: ' + file);
   }
 
   const fileUrl = process.platform === 'win32' ? new URL(`file:///${file}`) : new URL(`file://${file}`);
@@ -117,8 +119,12 @@ export function urlResolve(from = '', to = '') {
   return path.join(from.replace(/[^/]+$/, ''), to);
 }
 
-function isAbsolute(href) {
-  return !Buffer.isBuffer(href) && path.isAbsolute(href);
+function isFilePath(href) {
+  return typeof href === 'string' && !Buffer.isBuffer(href) && !isRemote(href);
+}
+
+export function isAbsolute(href) {
+  return isFilePath(href) && path.isAbsolute(href);
 }
 
 /**
@@ -127,7 +133,7 @@ function isAbsolute(href) {
  * @returns {boolean} True if the path is relative
  */
 function isRelative(href) {
-  return !Buffer.isBuffer(href) && !isRemote(href) && !isAbsolute(href);
+  return isFilePath(href) && !isAbsolute(href);
 }
 
 /**
@@ -518,8 +524,6 @@ export async function getDocumentPath(file, options = {}) {
     return normalizePath(`/${path.relative(base, file.path || base)}`);
   }
 
-  console.log('getDocumentPath')
-
   // Check local and assume base path based on relative stylesheets
   if (file.stylesheets) {
     const relativeRefs = file.stylesheets.filter((href) => isRelative(href));
@@ -720,7 +724,7 @@ export async function getAssetPaths(document, file, options = {}, strict = true)
 
   // Filter non-existent paths
   const filtered = await filterAsync(paths, (f) => {
-    if (!f || (!isRemote(f) && !f?.includes(process.cwd()))) {
+    if (!f || (isAbsolute(f) && !f?.includes(process.cwd()))) {
       return false;
     }
 
diff --git a/test/cli.test.js b/test/cli.test.js
index ca7516d0..9a28f210 100644
--- a/test/cli.test.js
+++ b/test/cli.test.js
@@ -38,18 +38,15 @@ const getArgs = async (params = []) => {
   await import('../cli.js');
   process.argv = origArgv;
   const {generate} = await import('../index.js');
-  // console.log('GENERATE:', generate.mock);
   const [args] = generate.mock.calls;
   const [opts] = args || [{}];
   expect(generate).toHaveBeenCalledTimes(1);
   return opts || {};
-  // return {};
 };
 
 const pipe = async (filename, args = []) => {
   const cat = process.platform === 'win32' ? 'type' : 'cat';
   const cmd = `${cat} ${filename} | node ${criticalBin} ${args.join(' ')}`;
-  console.log(cmd);
   return pExec(cmd, {shell: true});
 };
 
@@ -105,7 +102,7 @@ describe('CLI', () => {
       expect(nn(stdout)).toBe(expected);
     });
 
-    test.only('Pipe html file inside a folder to critical', async () => {
+    test('Pipe html file inside a folder to critical', async () => {
       const {stdout, stderr} = await pipe(path.normalize('fixtures/folder/generate-default.html'), [
         '--base',
         'fixtures',
diff --git a/test/file.test.js b/test/file.test.js
index 99950ee4..a8a659c8 100644
--- a/test/file.test.js
+++ b/test/file.test.js
@@ -16,6 +16,7 @@ import {FileNotFoundError} from '../src/errors.js';
 import {
   BASE_WARNING,
   isRemote,
+  isAbsolute,
   checkCssOption,
   fileExists,
   joinPath,
@@ -88,6 +89,18 @@ test('Remote file detection', () => {
   remote.forEach((p) => expect(isRemote(p)).toBe(true));
 });
 
+test('Absolute file detection', () => {
+  const invalid = ['', false, {}];
+  const absolute = ['/usr/tmp/bar'];
+  const relative = ['../test/foo.html', './usr/tmp/bar'];
+  const remote = ['https://test.io/', '//test.io/styles/main.css'];
+
+  invalid.forEach((p) => expect(isAbsolute(p)).toBe(false));
+  relative.forEach((p) => expect(isAbsolute(p)).toBe(false));
+  remote.forEach((p) => expect(isAbsolute(p)).toBe(false));
+  absolute.forEach((p) => expect(isAbsolute(p)).toBe(true));
+});
+
 test('Error for file not found', () => {
   expect(vinylize({filenpath: 'non-existant-file.html'})).rejects.toThrow(FileNotFoundError);
 });