diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index a54d345fa..682c647f0 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -146,7 +146,7 @@ module ApplicationHelper
   # 用户图像url，如果不存在的话，source为匿名用户，即默认使用匿名用户图像
   def url_to_avatar(source)
     if File.exist?(disk_filename(source&.class, source&.id))
-      ctime = File.ctime(disk_filename(source.class, source.id)).to_i
+      ctime = File.ctime(disk_filename(source.class, source&.id)).to_i
       if %w(User Organization).include?(source.class.to_s)
         File.join("images", relative_path, ["#{source.class}", "#{source&.id}"]) + "?t=#{ctime}"
       else
diff --git a/app/helpers/avatar_helper.rb b/app/helpers/avatar_helper.rb
index 607e4ce29..21cffd1be 100644
--- a/app/helpers/avatar_helper.rb
+++ b/app/helpers/avatar_helper.rb
@@ -13,7 +13,7 @@ module AvatarHelper
 
   def url_to_avatar(source)
     if File.exist?(disk_filename(source&.class, source&.id))
-      ctime = File.ctime(disk_filename(source.class, source.id)).to_i
+      ctime = File.ctime(disk_filename(source.class, source&.id)).to_i
       if %w(User Organization).include?(source.class.to_s)
         File.join("images", relative_path, ["#{source.class}", "#{source&.id}"]) + "?t=#{ctime}"
       else