diff --git a/code/app/Services/ModifiersService.php b/code/app/Services/ModifiersService.php
index 8eb5c145..7f7dbd6b 100644
--- a/code/app/Services/ModifiersService.php
+++ b/code/app/Services/ModifiersService.php
@@ -96,7 +96,7 @@ public function update($id, array $request)
         }
         else {
             $thresholds = $request['threshold'] ?? [];
-            $amounts = $request['amount'];
+            $amounts = $request['amount'] ?? [];
 
             foreach($thresholds as $index => $threshold) {
                 $threshold = trim($threshold);