diff --git a/packages/nx/src/plugins/js/index.ts b/packages/nx/src/plugins/js/index.ts
index bc2d78223af8b..185bd51ffaf40 100644
--- a/packages/nx/src/plugins/js/index.ts
+++ b/packages/nx/src/plugins/js/index.ts
@@ -34,11 +34,15 @@ export const processProjectGraph: ProjectGraphProcessor = async (
       let parsedLockFile: ProjectGraph;
       if (lockFileNeedsReprocessing(lockHash)) {
         parsedLockFile = parseLockFile();
-        writeLastProcessedLockfileHash(lockHash, parsedLockFile);
+        if (parsedLockFile) {
+          writeLastProcessedLockfileHash(lockHash, parsedLockFile);
+        }
       } else {
         parsedLockFile = readParsedLockFile();
       }
-      builder.mergeProjectGraph(parsedLockFile);
+      if (parsedLockFile) {
+        builder.mergeProjectGraph(parsedLockFile);
+      }
     }
   }