diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/PopBackwardPropagationTransformer.kt b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/PopBackwardPropagationTransformer.kt
index 5ce708648a9..44bba2a7542 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/PopBackwardPropagationTransformer.kt
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/optimization/boxing/PopBackwardPropagationTransformer.kt
@@ -33,9 +33,17 @@ import java.util.*
 class PopBackwardPropagationTransformer : MethodTransformer() {
     override fun transform(internalClassName: String, methodNode: MethodNode) {
         if (!OptimizationMethodVisitor.canBeOptimizedUsingSourceInterpreter(methodNode)) return
+        if (methodNode.instructions.toArray().any { it.isUnsafeStackInsn() }) return
         Transformer(methodNode).transform()
     }
 
+    // TODO better stack operations analysis
+    private fun AbstractInsnNode.isUnsafeStackInsn() =
+            opcode == Opcodes.DUP_X1 ||
+            opcode == Opcodes.DUP_X2 ||
+            opcode == Opcodes.DUP2_X1 ||
+            opcode == Opcodes.DUP2_X2
+
     private class Transformer(val methodNode: MethodNode) {
         private interface Transformation {
             fun apply(insn: AbstractInsnNode)