diff --git a/ets2panda/compiler/lowering/ets/constantExpressionLowering.cpp b/ets2panda/compiler/lowering/ets/constantExpressionLowering.cpp
index eb32e5f0040da45702a05a8db8b7475afe2431f9..53225c3e9e3507cd50304ddc171fa470bc25807b 100644
--- a/ets2panda/compiler/lowering/ets/constantExpressionLowering.cpp
+++ b/ets2panda/compiler/lowering/ets/constantExpressionLowering.cpp
@@ -21,6 +21,7 @@
 #include "checker/ETSchecker.h"
 #include "checker/types/typeError.h"
 #include "compiler/lowering/util.h"
+#include "generated/tokenType.h"
 #include "ir/expressions/literals/undefinedLiteral.h"
 #include "compiler/lowering/scopesInit/scopesInitPhase.h"
 #include "util/helpers.h"
@@ -148,6 +149,11 @@ static bool TestLiteral(const ir::Literal *lit)
     if (lit->IsNumberLiteral()) {
         return !lit->AsNumberLiteral()->Number().IsZero();
     }
+
+    if (lit->IsUndefinedLiteral()) {
+        return false;
+    }
+
     ES2PANDA_UNREACHABLE();
 }
 
@@ -710,6 +716,15 @@ private:
             }
         }
 
+        if(left->IsUndefinedLiteral() && right->IsUndefinedLiteral()) {
+            bool res = (opType == lexer::TokenType::PUNCTUATOR_EQUAL || opType == lexer::TokenType::PUNCTUATOR_STRICT_EQUAL);
+            return CreateBooleanLiteral(res);
+        }
+
+        if (left->IsUndefinedLiteral() || right->IsUndefinedLiteral()) {
+            return PerformRelationOperation(left, right, opType);
+        }
+
         LogError(diagnostic::WRONG_OPERAND_TYPE_FOR_BINARY_EXPRESSION, {}, expr->Start());
         return nullptr;
     }
@@ -802,6 +817,10 @@ private:
     ir::Literal *HandleLogicalExpression(const ir::BinaryExpression *expr, const ir::Literal *left,
                                          const ir::Literal *right)
     {
+        if (left->IsUndefinedLiteral() || right->IsUndefinedLiteral()) {
+            return nullptr;
+        }
+
         bool lhs = TestLiteral(left);
         bool rhs = TestLiteral(right);
 
diff --git a/ets2panda/compiler/lowering/ets/constantExpressionLowering.h b/ets2panda/compiler/lowering/ets/constantExpressionLowering.h
index 487cbeaa2a01ad947d1c8296de9e156c70383058..f99d093336d11fd15a3d78f92d3cd9ec6634640f 100644
--- a/ets2panda/compiler/lowering/ets/constantExpressionLowering.h
+++ b/ets2panda/compiler/lowering/ets/constantExpressionLowering.h
@@ -37,7 +37,7 @@ inline ir::Literal *AsSupportedLiteral(ir::Expression *const node)
 
     auto literal = node->AsLiteral();
     if (IsValidNumberLiteral(literal) || literal->IsCharLiteral() || literal->IsBooleanLiteral() ||
-        literal->IsStringLiteral()) {
+        literal->IsStringLiteral() || literal->IsUndefinedLiteral()) {
         return literal;
     }
     return nullptr;