diff --git a/app/controllers/experiments_controller.rb b/app/controllers/experiments_controller.rb
index c069e53ec..07643c977 100644
--- a/app/controllers/experiments_controller.rb
+++ b/app/controllers/experiments_controller.rb
@@ -236,6 +236,11 @@ class ExperimentsController < ApplicationController
   end
 
   def updated_img
+    if @experiment.workflowimg_file_name.present? && !@experiment.workflowimg.attached?
+      @experiment.generate_workflow_img
+      @experiment.update(workflowimg_file_name: nil)
+    end
+
     if @experiment.workflowimg.attached? && !@experiment.workflowimg_exists?
       @experiment.workflowimg.purge
       @experiment.generate_workflow_img