--- a/toolkit/components/osfile/osfile_async_worker.js
+++ b/toolkit/components/osfile/osfile_async_worker.js
@@ -33,17 +33,17 @@ if (this.Components) {
 
        let start;
        let options;
        if (data.args) {
          options = data.args[data.args.length - 1];
        }
        // If |outExecutionDuration| option was supplied, start measuring the
        // duration of the operation.
-       if (typeof options === "object" && "outExecutionDuration" in options) {
+       if (options && typeof options === "object" && "outExecutionDuration" in options) {
          start = Date.now();
        }
 
        let result;
        let exn;
        let durationMs;
        try {
          let method = data.fun;

--- a/toolkit/components/osfile/tests/mochi/main_test_osfile_async.js
+++ b/toolkit/components/osfile/tests/mochi/main_test_osfile_async.js
@@ -925,10 +925,15 @@ let test_duration = maketest("duration",
       // measurement.
       outExecutionDuration: copyOptions.outExecutionDuration,
       tmpPath: tmpPath
     };
     backupDuration = writeAtomicOptions.outExecutionDuration;
     yield OS.File.writeAtomic(pathDest, contents, writeAtomicOptions);
     test.ok(copyOptions.outExecutionDuration >= backupDuration);
     OS.File.remove(pathDest);
+
+    // Testing an operation that doesn't take arguments at all
+    let file = yield OS.File.open(pathSource);
+    yield file.stat();
+    yield file.close();
   });
 });