diff --git a/ets2panda/checker/ets/typeCheckingHelpers.cpp b/ets2panda/checker/ets/typeCheckingHelpers.cpp
index 01d4584093e6379412ffa5d93baa8b310f8fef68..c3cb5f326317f205848e643100d8a1392247583f 100644
--- a/ets2panda/checker/ets/typeCheckingHelpers.cpp
+++ b/ets2panda/checker/ets/typeCheckingHelpers.cpp
@@ -685,7 +685,9 @@ Type *ETSChecker::GuaranteedTypeForUnionFieldAccess(ir::MemberExpression *member
     const auto &types = etsUnionType->ConstituentTypes();
     ArenaVector<checker::Type *> apparentTypes {ProgramAllocator()->Adapter()};
     const auto *prop = memberExpression->Property();
-    const auto &propertyName = prop->IsIdentifier() ? prop->AsIdentifier()->Name() : prop->AsStringLiteral()->Str();
+    const auto &propertyName = prop->IsIdentifier()      ? prop->AsIdentifier()->Name()
+                               : prop->IsStringLiteral() ? prop->AsStringLiteral()->Str()
+                                                         : "";
     for (auto *type : types) {
         auto searchFlags = PropertySearchFlags::SEARCH_FIELD | PropertySearchFlags::SEARCH_METHOD |
                            PropertySearchFlags::SEARCH_IN_BASE;
diff --git a/ets2panda/test/ast/compiler/ets/union_field_access.ets b/ets2panda/test/ast/compiler/ets/union_field_access.ets
index 33cb90075f7fa1295cef7c0d4e22a26a10d9202c..942376e3ac74bc72b8d8a04a607f0df2e3f6a5f3 100644
--- a/ets2panda/test/ast/compiler/ets/union_field_access.ets
+++ b/ets2panda/test/ast/compiler/ets/union_field_access.ets
@@ -25,7 +25,19 @@ interface TypeB {
 }
 
 function IfWithString(val: U) {
-    return /* @@ label */val['kind'] === 'B'
+    return val['kind'] === 'B'
 }
 
-/* @@@ label Error TypeError: Indexed access is not supported for such expression type. */
+(a ? delete arguments==({: false, Float64Array: []}) : [ArrayBuffer[false]])
+
+/* @@? 28:12 Error TypeError: Indexed access is not supported for such expression type. */
+/* @@? 31:1 Error TypeError: Indexed access is not supported for such expression type. */
+/* @@? 31:2 Error TypeError: Unresolved reference a */
+/* @@? 31:6 Error TypeError: Unresolved reference delete */
+/* @@? 31:13 Error SyntaxError: Unexpected token. */
+/* @@? 31:13 Error TypeError: Unresolved reference arguments */
+/* @@? 31:24 Error TypeError: need to specify target type for class composite */
+/* @@? 31:26 Error SyntaxError: Unexpected token. */
+/* @@? 31:28 Error SyntaxError: Unexpected token. */
+/* @@? 31:54 Error SyntaxError: Unexpected token, expected ')'. */
+/* @@? 31:76 Error SyntaxError: Unexpected token ')'. */