diff --git a/core/src/main/java/io/mvnpm/esbuild/install/WebDepsInstaller.java b/core/src/main/java/io/mvnpm/esbuild/install/WebDepsInstaller.java
index 9fecedc..674526e 100644
--- a/core/src/main/java/io/mvnpm/esbuild/install/WebDepsInstaller.java
+++ b/core/src/main/java/io/mvnpm/esbuild/install/WebDepsInstaller.java
@@ -79,6 +79,10 @@ public static boolean install(Path nodeModulesDir, List<WebDependency> dependenc
                     final String packageName = nameAndRoot.getKey();
                     final Path source = nameAndRoot.getValue();
                     final Path target = nodeModulesDir.resolve(packageName);
+                    if (!Files.isDirectory(source)) {
+                        LOG.debugf("ignored package ''%s'' probably installed through another package.json", packageName);
+                        continue;
+                    }
                     dirs.add(packageName);
                     PathUtils.deleteRecursive(target);
                     Files.createDirectories(target.getParent());
diff --git a/core/src/main/java/io/mvnpm/esbuild/util/JarInspector.java b/core/src/main/java/io/mvnpm/esbuild/util/JarInspector.java
index 7117c8c..eb29213 100644
--- a/core/src/main/java/io/mvnpm/esbuild/util/JarInspector.java
+++ b/core/src/main/java/io/mvnpm/esbuild/util/JarInspector.java
@@ -117,7 +117,9 @@ private static Map<String, Path> findPackageNameAndRootWithPackage(Path root, bo
         List<Path> foundFiles = searchFiles(root, PACKAGE_JSON, shouldDoMultiple);
         for (Path path : foundFiles) {
             String packageName = readPackageName(path);
-            paths.putIfAbsent(packageName, path.getParent());
+            if (packageName != null) {
+                paths.putIfAbsent(packageName, path.getParent());
+            }
         }
 
         return paths;
@@ -187,6 +189,9 @@ private static String readPackageName(Properties properties) {
     private static String readPackageName(Path path) {
         try {
             JsonNode object = objectMapper.readTree(path.toFile());
+            if (!object.has("name")) {
+                return null;
+            }
             return object.get("name").asText();
         } catch (IOException ex) {
             throw new UncheckedIOException(ex);