diff --git a/src/rime/lever/deployment_tasks.cc b/src/rime/lever/deployment_tasks.cc
index 9b7656228f..cb4b94ffc3 100644
--- a/src/rime/lever/deployment_tasks.cc
+++ b/src/rime/lever/deployment_tasks.cc
@@ -386,16 +386,23 @@ static bool ConfigNeedsUpdate(Config* config) {
           "config_source_file", "", ".yaml"
       }));
   for (auto entry : *timestamps.AsMap()) {
-    fs::path source_file_path = resolver->ResolvePath(entry.first);
-    if (!fs::exists(source_file_path)) {
-      LOG(INFO) << "source file no longer exists: " << source_file_path.string();
-      return true;
-    }
     auto value = As<ConfigValue>(entry.second);
     int recorded_time = 0;
-    if (!value || !value->GetInt(&recorded_time) ||
-        recorded_time != (int) fs::last_write_time(source_file_path)) {
-      LOG(INFO) << "source file changed: " << source_file_path.string();
+    if (!value || !value->GetInt(&recorded_time)) {
+      LOG(WARNING) << "invalid timestamp for " << entry.first;
+      return true;
+    }
+    fs::path source_file = resolver->ResolvePath(entry.first);
+    if (!fs::exists(source_file)) {
+      if (recorded_time) {
+        LOG(INFO) << "source file no longer exists: " << source_file.string();
+        return true;
+      }
+      continue;
+    }
+    if (recorded_time != (int) fs::last_write_time(source_file)) {
+      LOG(INFO) << "source file " << (recorded_time ? "changed: " : "added: ")
+                << source_file.string();
       return true;
     }
   }