diff --git a/platform/script-debugger/debugger-ui/src/com/intellij/javascript/debugger/NameMapper.kt b/platform/script-debugger/debugger-ui/src/com/intellij/javascript/debugger/NameMapper.kt
index a3aa85b90b15..45c551b8de82 100644
--- a/platform/script-debugger/debugger-ui/src/com/intellij/javascript/debugger/NameMapper.kt
+++ b/platform/script-debugger/debugger-ui/src/com/intellij/javascript/debugger/NameMapper.kt
@@ -32,7 +32,7 @@ open class NameMapper(private val document: Document, private val transpiledDocu
 
   protected fun doMap(identifierOrNamedElement: PsiElement, mapBySourceCode: Boolean): String? {
     val mappings = getMappingsForElement(identifierOrNamedElement)
-    if (mappings == null) return null
+    if (mappings == null || mappings.isEmpty()) return null
     val sourceEntry = mappings[0]
     val generatedName: String?
     try {