diff --git a/lib/web/data.js b/lib/web/data.js
index 00a075b..843187c 100644
--- a/lib/web/data.js
+++ b/lib/web/data.js
@@ -94,6 +94,9 @@ exports.syncTaskToFile = function (cb) {
                 project_map[i] = "";
             }
         }
+        if (!project_map){
+            project_map = {};
+        }
         fs.writeFileSync(libdata2.ProjectMapPath, JSON.stringify(project_map))
         if (cb) cb();
     })