diff --git a/compiler/tests-common/org/jetbrains/kotlin/test/testFramework/mock/MockEditorFactory.java b/compiler/tests-common/org/jetbrains/kotlin/test/testFramework/mock/MockEditorFactory.java
index 7473ec9cd2f..db942a72934 100644
--- a/compiler/tests-common/org/jetbrains/kotlin/test/testFramework/mock/MockEditorFactory.java
+++ b/compiler/tests-common/org/jetbrains/kotlin/test/testFramework/mock/MockEditorFactory.java
@@ -19,6 +19,7 @@ import com.intellij.openapi.Disposable;
 import com.intellij.openapi.editor.Document;
 import com.intellij.openapi.editor.Editor;
 import com.intellij.openapi.editor.EditorFactory;
+import com.intellij.openapi.editor.EditorKind;
 import com.intellij.openapi.editor.event.EditorEventMulticaster;
 import com.intellij.openapi.editor.event.EditorFactoryListener;
 import com.intellij.openapi.editor.impl.DocumentImpl;
@@ -27,6 +28,7 @@ import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.util.text.CharArrayCharSequence;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 public class MockEditorFactory extends EditorFactory {
   @Override
@@ -59,6 +61,27 @@ public class MockEditorFactory extends EditorFactory {
     return null;
   }
 
+  @Override
+  public Editor createEditor(
+          @NotNull Document document, @Nullable Project project, @NotNull EditorKind kind
+  ) {
+    return null;
+  }
+
+  @Override
+  public Editor createEditor(
+          @NotNull Document document, Project project, @NotNull VirtualFile file, boolean isViewer, @NotNull EditorKind kind
+  ) {
+    return null;
+  }
+
+  @Override
+  public Editor createViewer(
+          @NotNull Document document, @Nullable Project project, @NotNull EditorKind kind
+  ) {
+    return null;
+  }
+
   @Override
   public void releaseEditor(@NotNull Editor editor) {
   }
diff --git a/idea/src/org/jetbrains/kotlin/idea/debugger/NoStrataPositionManagerHelper.kt b/idea/src/org/jetbrains/kotlin/idea/debugger/NoStrataPositionManagerHelper.kt
index 637f64c1fb0..97eec82d9d9 100644
--- a/idea/src/org/jetbrains/kotlin/idea/debugger/NoStrataPositionManagerHelper.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/debugger/NoStrataPositionManagerHelper.kt
@@ -146,7 +146,7 @@ private fun readClassFileImpl(project: Project,
     fun readFromOutput(isForTestClasses: Boolean): ByteArray? {
         if (!ProjectRootsUtil.isProjectSourceFile(project, file)) return null
 
-        val module = ProjectFileIndex.SERVICE.getInstance(project).getModuleForFile(file)
+        val module = ProjectFileIndex.SERVICE.getInstance(project).getModuleForFile(file) ?: return null
         val outputDir = CompilerPaths.getModuleOutputDirectory(module, /*forTests = */ isForTestClasses) ?: return null
 
         val className = fqNameWithInners.asString().replace('.', '$')