diff --git a/java/java-tests/testData/inspection/overwrittenKey/OverwrittenKey.java b/java/java-tests/testData/inspection/overwrittenKey/OverwrittenKey.java
index 9e51a53e35fc..62a9ee7fb71b 100644
--- a/java/java-tests/testData/inspection/overwrittenKey/OverwrittenKey.java
+++ b/java/java-tests/testData/inspection/overwrittenKey/OverwrittenKey.java
@@ -49,4 +49,15 @@ class OverwrittenKey {
     Map<String, String> map2 = Map.ofEntries(Map.entry("a", "a"), Map.entry(<warning descr="Duplicate Map key">"b"</warning>, "b"),
                                              Map.entry("c", "b"), Map.entry(<warning descr="Duplicate Map key">"b"</warning>, "d"));
   }
+  
+  void localClass() {
+    class X extends HashMap<String, String> {
+      class Y {
+        void test() {
+          put(<warning descr="Duplicate Map key">"a"</warning>, "b");
+          put(<warning descr="Duplicate Map key">"a"</warning>, "c");
+        }
+      }
+    }
+  }
 }
\ No newline at end of file
diff --git a/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/psiutils/ExpressionUtils.java b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/psiutils/ExpressionUtils.java
index 20b4788ef3b4..ad443d399cad 100644
--- a/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/psiutils/ExpressionUtils.java
+++ b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/psiutils/ExpressionUtils.java
@@ -15,6 +15,7 @@ import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.util.InheritanceUtil;
 import com.intellij.psi.util.*;
 import com.intellij.util.ArrayUtil;
+import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.containers.ContainerUtil;
 import com.siyeh.HardcodedMethodConstants;
 import com.siyeh.ig.callMatcher.CallMatcher;
@@ -941,7 +942,15 @@ public class ExpressionUtils {
             containingClass = ClassUtils.getContainingClass(containingClass);
           }
           if (containingClass != null) {
-            return factory.createExpressionFromText(containingClass.getQualifiedName() + "." + PsiKeyword.THIS, ref);
+            String thisQualifier = containingClass.getQualifiedName();
+            if (thisQualifier == null) {
+              if (PsiUtil.isLocalClass(containingClass)) {
+                thisQualifier = containingClass.getName();
+              } else {
+                throw new IncorrectOperationException("Anonymous surrounding class");
+              }
+            }
+            return factory.createExpressionFromText(thisQualifier + "." + PsiKeyword.THIS, ref);
           }
         }
       }