NoMethodError in Project#projectdetails

Showing /root/webapp/donation/app/views/project/projectdetails.html.erb where line #851 raised:

undefined method `+' for nil:NilClass
Extracted source (around line #851):
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851
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<!--Code checking for project-creator-image end-->
<!--Every Project Percentage -->
<% project_percentage = (@Get_Project_By_Project_id[0]['amount_raised']+@Get_Project_By_Project_id[0]['extra_amount_raised']).to_f.round(2) / @Get_Project_By_Project_id[0]['project_funding_goal'].to_f.round(2) * 100.0 %>
<% final_percentage = project_percentage.floor(0) %>
<!--Every Project Percentage -->
<!-- Getting Project Image From database -->

Rails.root: /root/webapp/donation

Application Trace | Framework Trace | Full Trace

Request

Parameters:

{"protitle"=>"Besoindemereconstruireunanaprès", "pid"=>"275"}

Response

Headers:

None