diff --git a/public/partdb.js b/public/partdb.js
index a9f8d1a..d5e5498 100644
--- a/public/partdb.js
+++ b/public/partdb.js
@@ -113,12 +113,13 @@ function select_part()
 				for (const table of tables) {
 					const tbody = document.getElementById(table);
 					tbody.innerHTML = null;
+					const content = part[table].slice();
 					if ("components" == table) {
-						part[table].push({name: "", quantity: ""}); // empty field to add
+						content.push({name: "", quantity: ""}); // empty field to add
 					} else {
-						part[table].push({name: "", value: ""}); // empty field to add
+						content.push({name: "", value: ""}); // empty field to add
 					}
-					for (const row of part[table]) {
+					for (const row of content) {
 						const tr = document.createElement('tr');
 						let td = document.createElement('td');
 						let input = document.createElement('input');