diff --git a/packages/namespace/lib/namespace-helper-ast.js b/packages/namespace/lib/namespace-helper-ast.js
index fe1bb12..3d8ada5 100644
--- a/packages/namespace/lib/namespace-helper-ast.js
+++ b/packages/namespace/lib/namespace-helper-ast.js
@@ -26,7 +26,7 @@ function addArguments(builders) {
 }
 
 function addNamespaceArguments(node, moduleName, builders) {
-  if (node.path.original !== 'style-namespace') return;
+  if (Object.prototype.hasOwnProperty.call(node.path, 'value') || node.path.original !== 'style-namespace') return;
 
   const allArguments = getArguments(moduleName);
   const neededArguments = allArguments.filter(
diff --git a/packages/preprocessor/index.js b/packages/preprocessor/index.js
index ac65dff..430ae57 100644
--- a/packages/preprocessor/index.js
+++ b/packages/preprocessor/index.js
@@ -27,7 +27,7 @@ module.exports = {
 
     const options = this._options(app);
     const preprocessors = Object.assign({}, options.preprocessors);
-    registry.add('css', new Preprocessor(preprocessors));
+    registry.add('css', new Preprocessor(preprocessors, options.outputPaths));
   },
 
   name: require('./package').name,
diff --git a/packages/preprocessor/lib/preprocessor.js b/packages/preprocessor/lib/preprocessor.js
index df4d021..39af00c 100644
--- a/packages/preprocessor/lib/preprocessor.js
+++ b/packages/preprocessor/lib/preprocessor.js
@@ -7,8 +7,9 @@ const merge = require('broccoli-merge-trees');
 const witeFile = require('broccoli-file-creator');
 
 module.exports = class Preprocessors {
-  constructor(preprocessors) {
+  constructor(preprocessors, outputPaths) {
     this.preprocessors = preprocessors;
+    this.outputPaths = outputPaths;
     this.ext = this.extensions;
   }
 
@@ -26,7 +27,8 @@ module.exports = class Preprocessors {
   toTree(node, inputPath, outputPath, options) {
     const styles = [];
 
-    for (const [project, outFile] of Object.entries(options.outputPaths)) {
+    // the `??` is for `ember-cli` 5 compatibility
+    for (const [project, outFile] of Object.entries(this.outputPaths ?? options.outputPaths)) {
       styles.push(
         this.preprocess({
           node,