diff --git a/core/src/main/java/org/teavm/model/classes/VirtualTableBuilder.java b/core/src/main/java/org/teavm/model/classes/VirtualTableBuilder.java
index cb2903246..7755cb671 100644
--- a/core/src/main/java/org/teavm/model/classes/VirtualTableBuilder.java
+++ b/core/src/main/java/org/teavm/model/classes/VirtualTableBuilder.java
@@ -274,6 +274,9 @@ public class VirtualTableBuilder {
             Set<String> visited) {
         while (visited.add(className)) {
             TableBuilder table = tables.get(className);
+            if (table == null) {
+                break;
+            }
             EntryBuilder entry = table.entries.get(method);
             if (entry == null) {
                 entry = new EntryBuilder();