diff --git a/ets2panda/checker/ets/conversion.cpp b/ets2panda/checker/ets/conversion.cpp
index 90c5d2f5be896c9e5a163c814e21236480cb8378..71de0b5aff59841760fa87fc511e22c287f1f2d5 100644
--- a/ets2panda/checker/ets/conversion.cpp
+++ b/ets2panda/checker/ets/conversion.cpp
@@ -68,14 +68,15 @@ bool IsAllowedNarrowingReferenceConversionObjectObject(TypeRelation *const relat
 
     // 3. S is a class type, T is an interface type, and S names class not marked as final.
     if (source->HasObjectFlag(ETSObjectFlags::CLASS) && target->HasObjectFlag(ETSObjectFlags::INTERFACE) &&
-        !source->GetDeclNode()->IsFinal()) {
+        source->GetDeclNode() != nullptr && !source->GetDeclNode()->IsFinal()) {
         return true;
     }
 
     // 4. S is a class type, T is an interface type, and S names a class that is marked as final and that
     //    implements the interface named by T.
     if (source->HasObjectFlag(ETSObjectFlags::CLASS) && target->HasObjectFlag(ETSObjectFlags::INTERFACE) &&
-        source->GetDeclNode()->IsFinal() && relation->IsSupertypeOf(source, target)) {
+        source->GetDeclNode() != nullptr && source->GetDeclNode()->IsFinal() &&
+        relation->IsSupertypeOf(source, target)) {
         return true;
     }
 
diff --git a/ets2panda/test/ast/compiler/ets/reference_conversion.ets b/ets2panda/test/ast/compiler/ets/reference_conversion.ets
new file mode 100644
index 0000000000000000000000000000000000000000..9bc2aaead19453fe3c948b3dc70b068c958fb5ee
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/reference_conversion.ets
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import A C, X as D} from 'z';
+
+interface D {
+    f : nuted
+
+/* @@? 16:10 Error SyntaxError: Unexpected token, expected 'from'. */
+/* @@? 16:11 Error SyntaxError: Unexpected token, expected 'from'. */
+/* @@? 16:13 Error SyntaxError: Unexpected token, expected string literal. */
+/* @@? 16:13 Error TypeError: Cannot cast type '"*ERROR_LITERAL*"' to 'D' */
+/* @@? 16:19 Error SyntaxError: Unexpected token '}'. */
+/* @@? 16:21 Error SyntaxError: Unexpected token 'from'. */
+/* @@? 16:21 Error TypeError: Unresolved reference from */
+/* @@? 16:26 Error SyntaxError: Unexpected token 'z'. */
+/* @@? 19:9 Error TypeError: Cannot find type 'nuted'. */
+/* @@? 31:1 Error SyntaxError: Unexpected token, expected '}'. */