diff --git a/index.php b/index.php
index 8560c85..94b75ef 100644
--- a/index.php
+++ b/index.php
@@ -250,17 +250,20 @@ if (!$isConfig and !$supplierIsNew and $hasSupplier) {
 	switch ($action) {
 	case 'insert' :
 	case 'delete' :
+		$item = [];
+
+		foreach (['name', 'choice', 'action'] as $field)
+			$item[$field] = filter_var($_REQUEST[$field], FILTER_SANITIZE_STRING);
+		$item['timestamp'] = time();
+		$hash = md5(implode([ $item['name'], $item['choice'], ]));
+		$item['hash'] = $hash;
+
 		$isBeginning = (!file_exists(DATA_FILE) or in_array(filesize(DATA_FILE), [ false, 0 ]));
 		$output = fopen(DATA_FILE, 'a+');
 		if (!$output) break;
 		if (!flock($output, LOCK_EX)) break;
 		if ($isBeginning)
 			fwrite($output, '<?php' . PHP_EOL);
-		$item = [];
-		foreach (['name', 'choice', 'action'] as $field)
-			$item[$field] = filter_var($_REQUEST[$field], FILTER_SANITIZE_STRING);
-		$item['timestamp'] = time();
-		$item['hash'] = md5(implode([ $item['name'], $item['choice'], ]));
 		fprintf(
 			$output,
 			'$data[%s][%s][] = %s;' . PHP_EOL,
@@ -291,7 +294,12 @@ if (!$isConfig and !$supplierIsNew and $hasSupplier) {
 
 	foreach ($allItems as $item) {
 		if ($item['action'] === 'insert') {
-			$items[] = $item;
+			$alreadyInserted = false;
+			foreach ($items as $index => $prevItem)
+				if ($prevItem['hash'] === $item['hash'])
+					$alreadyInserted = true;
+			if (!$alreadyInserted)
+				$items[] = $item;
 		} elseif ($item['action'] === 'delete') {
 			foreach ($items as $index => $prevItem)
 				if ($prevItem['hash'] === $item['hash'])