diff --git a/core/src/main/java/org/teavm/model/classes/VirtualTableProvider.java b/core/src/main/java/org/teavm/model/classes/VirtualTableProvider.java
index 6babd9054..9c4a9ef87 100644
--- a/core/src/main/java/org/teavm/model/classes/VirtualTableProvider.java
+++ b/core/src/main/java/org/teavm/model/classes/VirtualTableProvider.java
@@ -61,6 +61,9 @@ public class VirtualTableProvider {
         VirtualTable table = new VirtualTable(className);
         virtualTables.put(className, table);
         ClassReader cls = classSource.get(className);
+        if (cls == null) {
+            return;
+        }
         if (cls.getParent() != null) {
             fillClass(cls.getParent());
             VirtualTable parentTable = virtualTables.get(cls.getParent());
diff --git a/core/src/main/java/org/teavm/model/lowlevel/ManagedMethodRepository.java b/core/src/main/java/org/teavm/model/lowlevel/ManagedMethodRepository.java
index af9826f1c..2f8c993be 100644
--- a/core/src/main/java/org/teavm/model/lowlevel/ManagedMethodRepository.java
+++ b/core/src/main/java/org/teavm/model/lowlevel/ManagedMethodRepository.java
@@ -44,6 +44,6 @@ public class ManagedMethodRepository {
             return false;
         }
         MethodReader method = cls.getMethod(methodReference.getDescriptor());
-        return method.getAnnotations().get(Unmanaged.class.getName()) == null;
+        return method == null || method.getAnnotations().get(Unmanaged.class.getName()) == null;
     }
 }