diff --git a/server.rb b/server.rb
index 4a4110c..1506e34 100755
--- a/server.rb
+++ b/server.rb
@@ -252,12 +252,12 @@ def add_part(part)
   if part["id"] then
     # ensure part to update exists
     statement = @db.prepare("SELECT id FROM part WHERE id = ?")
-    raise StandardError.new("id not valid") if statement.execute(part["id"]).to_a.empty?
+    raise ScriptError.new("id not valid") if statement.execute(part["id"]).to_a.empty?
   else
     # add new part
-    raise StandardError.new("name required") unless part["name"] and part["name"].length > 0
+    raise ScriptError.new("name required") unless part["name"] and part["name"].length > 0
     statement = @db.prepare("SELECT id FROM part WHERE name = ?")
-    raise StandardError.new("name already existing") unless statement.execute(part["name"]).to_a.empty?
+    raise ScriptError.new("name already existing") unless statement.execute(part["name"]).to_a.empty?
     insert = @db.prepare("INSERT INTO part (name) VALUES (?)");
     insert.execute(part["name"])
     part["id"] = statement.execute(part["name"]).to_a[0]["id"]
@@ -273,7 +273,7 @@ def add_part(part)
     else
       statement = @db.prepare("SELECT id FROM part WHERE name = ?")
       family = statement.execute(part[field]).to_a
-      raise StandardError.new("family not existing") if family.empty?
+      raise ScriptError.new("family not existing") if family.empty?
       update = @db.prepare("UPDATE part SET #{field} = ? WHERE id = ?")
       update.execute(family[0]["id"], part["id"])
       family = get_part_by_id(family[0]["id"])
@@ -384,7 +384,7 @@ def add_part(part)
       next unless row["quantity"]
       statement = @db.prepare("SELECT id FROM part WHERE LOWER(name) = ?")
       ref = statement.execute(row["name"].downcase).to_a[0]
-      #raise StandardError.new("component #{name} does not exist") unless ref
+      #raise ScriptError.new("component #{name} does not exist") unless ref
       next unless ref
       row["quantity"] ||= 0
       insert = @db.prepare("INSERT INTO assembly (assembled,component,quantity) VALUES (?,?,?)");
@@ -409,7 +409,7 @@ post '/part' do
   puts part if DEBUG
   begin
     add_part(part)
-  rescue StandardError => e
+  rescue ScriptError => e
     halt 401, e.message
   end
   return 200
@@ -438,7 +438,7 @@ get '/import/lcsc/:lcsc' do
   halt 401, "part #{part['name']} already exists" if existing
   begin
     add_part(part)
-  rescue StandardError => e
+  rescue ScriptError => e
     halt 401, e.message
   end
   i = 0