diff --git a/VirtualMachine/Ceres/TranslationEngine/Compiler.Expression.By.cs b/VirtualMachine/Ceres/TranslationEngine/Compiler.Expression.By.cs
index 00d796d..84a0404 100644
--- a/VirtualMachine/Ceres/TranslationEngine/Compiler.Expression.By.cs
+++ b/VirtualMachine/Ceres/TranslationEngine/Compiler.Expression.By.cs
@@ -33,8 +33,12 @@ public override void Visit(ByExpression byExpression)
 
                 Chunk.CodeGenerator.Emit(arms[i].DeepEquality ? OpCode.DEQ : OpCode.CEQ);
                 Chunk.CodeGenerator.Emit(OpCode.FJMP, labels[i]);
-                Chunk.CodeGenerator.Emit(OpCode.POP);
-                
+
+                if (i < arms.Count - 1)
+                {
+                    Chunk.CodeGenerator.Emit(OpCode.POP);
+                }
+
                 Visit(arms[i].ValueArm);
                 
                 if (arms[i].ValueArm is Expression)