diff --git a/plugins/kotlin-dataframe/src/org/jetbrains/kotlinx/dataframe/plugin/extensions/IrBodyFiller.kt b/plugins/kotlin-dataframe/src/org/jetbrains/kotlinx/dataframe/plugin/extensions/IrBodyFiller.kt
index a20e5ff71b..66ff2c9a57 100644
--- a/plugins/kotlin-dataframe/src/org/jetbrains/kotlinx/dataframe/plugin/extensions/IrBodyFiller.kt
+++ b/plugins/kotlin-dataframe/src/org/jetbrains/kotlinx/dataframe/plugin/extensions/IrBodyFiller.kt
@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlinx.dataframe.plugin.extensions
 
-import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import org.jetbrains.kotlin.backend.common.FileLoweringPass
@@ -18,8 +17,10 @@ import org.jetbrains.kotlin.ir.backend.js.utils.valueArguments
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrConstructor
 import org.jetbrains.kotlin.ir.declarations.IrDeclarationOrigin
+import org.jetbrains.kotlin.ir.declarations.IrDeclarationWithName
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
 import org.jetbrains.kotlin.ir.declarations.IrProperty
 import org.jetbrains.kotlin.ir.declarations.copyAttributes
 import org.jetbrains.kotlin.ir.declarations.createBlockBody
@@ -175,8 +176,9 @@ private class DataFrameFileLowering(val context: IrPluginContext) : FileLowering
 
         val constructors = context.referenceConstructors(ClassId(FqName("kotlin.jvm"), Name.identifier("JvmName")))
         val jvmName = constructors.single { it.owner.valueParameters.size == 1 }
-        val markerName = ((getter.extensionReceiverParameter!!.type as IrSimpleType).arguments.single() as IrSimpleType).classFqName?.shortName()!!
-        val jvmNameArg = "${markerName.identifier}_${declaration.name.identifier}"
+        val marker =
+            ((getter.extensionReceiverParameter!!.type as IrSimpleType).arguments.single() as IrSimpleType).classOrFail.owner
+        val jvmNameArg = "${marker.nestedName()}_${declaration.name.identifier}"
         getter.annotations = listOf(
             IrConstructorCallImpl(-1, -1, jvmName.owner.returnType, jvmName, 0, 0, 1)
                 .also {
@@ -218,6 +220,21 @@ private class DataFrameFileLowering(val context: IrPluginContext) : FileLowering
         return declaration
     }
 
+    private fun IrDeclarationWithName.nestedName() = buildString { computeNestedName(this@nestedName, this) }
+
+    private fun computeNestedName(declaration: IrDeclarationWithName, result: StringBuilder): Boolean {
+        when (val parent = declaration.parent) {
+            is IrClass -> {
+                if (!computeNestedName(parent, result)) return false
+            }
+            is IrPackageFragment -> {}
+            else -> return false
+        }
+        if (result.isNotEmpty()) result.append('_')
+        result.append(declaration.name.asString())
+        return true
+    }
+
     @OptIn(UnsafeDuringIrConstructionAPI::class)
     override fun visitErrorCallExpression(expression: IrErrorCallExpression): IrExpression {
         val origin = (expression.type.classifierOrNull?.owner as? IrClass)?.origin ?: return expression
diff --git a/plugins/kotlin-dataframe/src/org/jetbrains/kotlinx/dataframe/plugin/interpret.kt b/plugins/kotlin-dataframe/src/org/jetbrains/kotlinx/dataframe/plugin/interpret.kt
index 71ab5c561a..1dfa551416 100644
--- a/plugins/kotlin-dataframe/src/org/jetbrains/kotlinx/dataframe/plugin/interpret.kt
+++ b/plugins/kotlin-dataframe/src/org/jetbrains/kotlinx/dataframe/plugin/interpret.kt
@@ -148,7 +148,7 @@ fun <T> KotlinTypeFacade.interpret(
                         val interpreter = expression.loadInterpreter()
                         if (interpreter == null) {
                             // if the plugin already transformed call, its original form is the last expression of .let { }
-                            val argument = expression.arguments[0]
+                            val argument = expression.arguments.getOrNull(0)
                             val last = (argument as? FirAnonymousFunctionExpression)?.anonymousFunction?.body?.statements?.lastOrNull()
                             val call = (last as? FirReturnExpression)?.result as? FirFunctionCall
                             call?.loadInterpreter()?.let {
diff --git a/plugins/kotlin-dataframe/testData/box/duplicatedSignature1.kt b/plugins/kotlin-dataframe/testData/box/duplicatedSignature1.kt
new file mode 100644
index 0000000000..e540580374
--- /dev/null
+++ b/plugins/kotlin-dataframe/testData/box/duplicatedSignature1.kt
@@ -0,0 +1,47 @@
+package dataframe
+
+import org.jetbrains.kotlinx.dataframe.*
+import org.jetbrains.kotlinx.dataframe.columns.*
+import org.jetbrains.kotlinx.dataframe.annotations.*
+import org.jetbrains.kotlinx.dataframe.api.*
+import org.jetbrains.kotlinx.dataframe.io.*
+
+@DataSchema
+data class MyRecordModifiedStep2(
+    val group: Group,
+    val str: kotlin.String
+) {
+    @DataSchema
+    data class Group(
+        val a: kotlin.String,
+        val length: kotlin.Int
+    )
+}
+
+@DataSchema
+data class MyRecordModified(
+    val group: Group
+) {
+    @DataSchema
+    data class Group(
+        val a: kotlin.String,
+        val length: kotlin.Int
+    )
+}
+
+@DataSchema
+data class Group1(
+    val a: kotlin.String,
+)
+
+@DataSchema
+data class Group2(
+    val a: kotlin.String,
+)
+
+fun box(): String {
+    val df = dataFrameOf(MyRecordModified(MyRecordModified.Group("a", 123)))
+    // need to trigger JVM classloading so duplicated signature error can appear
+    df.group.a
+    return "OK"
+}
diff --git a/plugins/kotlin-dataframe/tests-gen/org/jetbrains/kotlin/fir/dataframe/DataFrameBlackBoxCodegenTestGenerated.java b/plugins/kotlin-dataframe/tests-gen/org/jetbrains/kotlin/fir/dataframe/DataFrameBlackBoxCodegenTestGenerated.java
index f28e3348b8..ffcdd2a659 100644
--- a/plugins/kotlin-dataframe/tests-gen/org/jetbrains/kotlin/fir/dataframe/DataFrameBlackBoxCodegenTestGenerated.java
+++ b/plugins/kotlin-dataframe/tests-gen/org/jetbrains/kotlin/fir/dataframe/DataFrameBlackBoxCodegenTestGenerated.java
@@ -124,6 +124,12 @@ public void testDuplicatedSignature() {
     runTest("testData/box/duplicatedSignature.kt");
   }
 
+  @Test
+  @TestMetadata("duplicatedSignature1.kt")
+  public void testDuplicatedSignature1() {
+    runTest("testData/box/duplicatedSignature1.kt");
+  }
+
   @Test
   @TestMetadata("explode.kt")
   public void testExplode() {