diff --git a/ets2panda/parser/ETSparser.cpp b/ets2panda/parser/ETSparser.cpp
index 9788c8d7af7f5e013f047bf08943aef018f006ce..a21da04abdb4b1fa03355a3815e996df12e7e65d 100644
--- a/ets2panda/parser/ETSparser.cpp
+++ b/ets2panda/parser/ETSparser.cpp
@@ -155,7 +155,7 @@ void ETSParser::ParseFileHeaderFlag(lexer::SourcePosition startLoc, ArenaVector<
 
     ir::Expression *fileHeaderFlag = ParseStringLiteral();
     auto *exprStatementNode = AllocNode<ir::ExpressionStatement>(fileHeaderFlag);
-
+    ES2PANDA_ASSERT(exprStatementNode != nullptr);
     exprStatementNode->SetRange({startLoc, fileHeaderFlag->End()});
     ConsumeSemicolon(exprStatementNode);
     if (statements != nullptr) {