diff --git a/db/migrate/20240524135850_create_affiliation.rb b/db/migrate/20240524135850_create_affiliation.rb
index 8802b77f..609a0073 100644
--- a/db/migrate/20240524135850_create_affiliation.rb
+++ b/db/migrate/20240524135850_create_affiliation.rb
@@ -40,17 +40,13 @@ def up
         elsif professor.institution_id == institution_id || ((end_date - start_date) <= 1.month)
           affiliation.update(start_date: start_date)
         end
-        # Se for a primeira versão do professor pega a data da primeira tese do professor e diminui um mês
-        if professor.paper_trail.previous_version.nil?
-          if initial_start_date.nil?
-            affiliation.update(start_date: start_date - 1.month)
-          else
-            affiliation.update(start_date: initial_start_date - 1.month)
-          end
-          break
-        end
         professor = professor.paper_trail.previous_version
       end
+      if initial_start_date.nil? || initial_start_date >= start_date
+        affiliation.update(start_date: start_date - 1.month)
+      elsif
+        affiliation.update(start_date: initial_start_date - 1.month)
+      end
       institutions << { institution_id:, start_date:, end_date: }
     end