diff --git a/tests/src/test/java/org/teavm/classlib/support/ReflectionSupplierImpl.java b/tests/src/test/java/org/teavm/classlib/support/ReflectionSupplierImpl.java
index 8f4c59886..312cf41e8 100644
--- a/tests/src/test/java/org/teavm/classlib/support/ReflectionSupplierImpl.java
+++ b/tests/src/test/java/org/teavm/classlib/support/ReflectionSupplierImpl.java
@@ -17,6 +17,7 @@ package org.teavm.classlib.support;
 
 import java.lang.invoke.SerializedLambda;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.Set;
 import org.teavm.classlib.ReflectionContext;
@@ -30,6 +31,9 @@ public class ReflectionSupplierImpl implements ReflectionSupplier {
     @Override
     public Collection<String> getAccessibleFields(ReflectionContext context, String className) {
         ClassReader cls = context.getClassSource().get(className);
+        if (cls == null) {
+            return Collections.emptyList();
+        }
         Set<String> fields = new HashSet<>();
         for (FieldReader field : cls.getFields()) {
             if (field.getAnnotations().get(Reflectable.class.getName()) != null) {
@@ -42,6 +46,9 @@ public class ReflectionSupplierImpl implements ReflectionSupplier {
     @Override
     public Collection<MethodDescriptor> getAccessibleMethods(ReflectionContext context, String className) {
         ClassReader cls = context.getClassSource().get(className);
+        if (cls == null) {
+            return Collections.emptyList();
+        }
         Set<MethodDescriptor> methods = new HashSet<>();
         for (MethodReader method : cls.getMethods()) {
             if (method.getAnnotations().get(Reflectable.class.getName()) != null) {