diff --git a/src/Builder/Extractor/ExpressionExtractor.php b/src/Builder/Extractor/ExpressionExtractor.php
index bd2aed37..ba555447 100644
--- a/src/Builder/Extractor/ExpressionExtractor.php
+++ b/src/Builder/Extractor/ExpressionExtractor.php
@@ -66,7 +66,7 @@ public function extractExpressions(array $syntaxTree): array
 
                         continue;
                     }
-                    $expressions[$key] = [...$expressions[$key], ...$this->getValue($chainAssignValue->getValue())];
+                    $expressions[$key] = array_merge($expressions[$key], $this->getValue($chainAssignValue->getValue()));
                 } catch (ValueExtractorException $exception) {
                     continue;
                 }