diff --git a/CHANGELOG.md b/CHANGELOG.md
index f14d4cd..5b57530 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@
 
 There are next changes:
 
+## 1.2.13
+
+There are next changes:
+
+- fixed a fatal error in the aggregator script
+
 ## 1.2.12
 
 There are next changes:
diff --git a/src/Badoo/LiveProfilerUI/Aggregator.php b/src/Badoo/LiveProfilerUI/Aggregator.php
index 0c90679..7ba2661 100644
--- a/src/Badoo/LiveProfilerUI/Aggregator.php
+++ b/src/Badoo/LiveProfilerUI/Aggregator.php
@@ -265,6 +265,7 @@ protected function aggregate() : bool
     protected function aggregateRow(array $map) : array
     {
         foreach ($this->fields as $param) {
+            $map[$param . 's'] = $map[$param . 's'] ?? '';
             $map[$param . 's'] = explode(',', rtrim($map[$param . 's'], ','));
             $map[$param] = array_sum($map[$param . 's']);
             foreach ($this->field_variations as $field_variation) {