diff --git a/src/main/java/info/sigterm/deob/Deob.java b/src/main/java/info/sigterm/deob/Deob.java
index c76916186d..9d6543dd65 100644
--- a/src/main/java/info/sigterm/deob/Deob.java
+++ b/src/main/java/info/sigterm/deob/Deob.java
@@ -1,14 +1,11 @@
 package info.sigterm.deob;
 
-import info.sigterm.deob.deobfuscators.IllegalStateExceptions;
-import info.sigterm.deob.deobfuscators.RuntimeExceptions;
-import info.sigterm.deob.deobfuscators.UnusedFields;
-import info.sigterm.deob.deobfuscators.UnusedMethods;
-import info.sigterm.deob.deobfuscators.UnusedParameters;
 import info.sigterm.deob.deobfuscators.ConstantParameter;
-import info.sigterm.deob.deobfuscators.MethodInliner;
+import info.sigterm.deob.deobfuscators.IllegalStateExceptions;
 import info.sigterm.deob.deobfuscators.RenameUnique;
+import info.sigterm.deob.deobfuscators.RuntimeExceptions;
 import info.sigterm.deob.deobfuscators.UnreachedCode;
+import info.sigterm.deob.deobfuscators.UnusedMethods;
 
 import java.io.ByteArrayOutputStream;
 import java.io.DataInputStream;
diff --git a/src/main/java/info/sigterm/deob/deobfuscators/ConstantParameter.java b/src/main/java/info/sigterm/deob/deobfuscators/ConstantParameter.java
index b48244c0b2..43636c2bb0 100644
--- a/src/main/java/info/sigterm/deob/deobfuscators/ConstantParameter.java
+++ b/src/main/java/info/sigterm/deob/deobfuscators/ConstantParameter.java
@@ -129,7 +129,7 @@ public class ConstantParameter implements Deobfuscator
 			
 			if (ctx.getPushed().getInstruction() instanceof PushConstantInstruction)
 			{
-				PushConstantInstruction pc = (PushConstantInstruction) ctx.getPushed().getInstruction();				
+				PushConstantInstruction pc = (PushConstantInstruction) ctx.getPushed().getInstruction();
 				
 				if (!(pc.getConstant().getObject() instanceof Number))
 					continue;
diff --git a/src/main/java/info/sigterm/deob/execution/Frame.java b/src/main/java/info/sigterm/deob/execution/Frame.java
index 71d9f7d203..336e942ca0 100644
--- a/src/main/java/info/sigterm/deob/execution/Frame.java
+++ b/src/main/java/info/sigterm/deob/execution/Frame.java
@@ -13,6 +13,8 @@ import info.sigterm.deob.attributes.code.Instructions;
 import info.sigterm.deob.attributes.code.instructions.LookupSwitch;
 import info.sigterm.deob.attributes.code.instructions.TableSwitch;
 import info.sigterm.deob.pool.NameAndType;
+import java.util.HashSet;
+import java.util.Set;
 import org.apache.commons.collections4.MultiMap;
 import org.apache.commons.collections4.map.MultiValueMap;
 
@@ -60,11 +62,7 @@ public class Frame
 		this.cur = other.cur;
 		this.stack = new Stack(other.stack);
 		this.variables = new Variables(other.variables);
-		//this.instructions = new ArrayList<>(other.instructions); // deep?
 		this.visited = other.visited;
-		
-//		for (InstructionContext ctx : other.instructions)
-//			instructions.add(new InstructionContext(other, ctx));
 	}
 	
 	public Frame dup()
diff --git a/src/main/java/info/sigterm/deob/execution/InstructionContext.java b/src/main/java/info/sigterm/deob/execution/InstructionContext.java
index 540426dbf7..672cdf63ae 100644
--- a/src/main/java/info/sigterm/deob/execution/InstructionContext.java
+++ b/src/main/java/info/sigterm/deob/execution/InstructionContext.java
@@ -11,6 +11,7 @@ public class InstructionContext
 {
 	private Instruction ins;
 	private Frame frame;
+	private Stack stack; // stack at time ins was executed
 	private List<StackContext> pops = new ArrayList<>(); // stack contexts popped by instruction execution
 	private List<StackContext> pushes = new ArrayList<>(); // stack contexts pushed by instruction execution
 	private List<VariableContext> reads = new ArrayList<>(); // lvt reads
@@ -20,6 +21,7 @@ public class InstructionContext
 	{
 		ins = i;
 		frame = f;
+		stack = new Stack(frame.getStack());
 	}
 	
 	public void pop(StackContext... ctx)
@@ -53,6 +55,11 @@ public class InstructionContext
 		return ins;
 	}
 	
+	public Stack getStack()
+	{
+		return stack;
+	}
+	
 	public List<StackContext> getPops()
 	{
 		return pops;
@@ -90,15 +97,18 @@ public class InstructionContext
 		if (ins != ic.ins)
 			return false;
 		
-		if (getPops().size() != ic.getPops().size())
+		// check if stack at time of execution is equal
+		Stack ours = new Stack(this.getStack()), // copy stacks since we destroy them
+			theirs = new Stack(ic.getStack());
+		
+		if (ours.getSize() != theirs.getSize())
 			return false;
 		
-		for (int i = 0; i < getPops().size(); ++i)
+		while (ours.getSize() > 0)
 		{
-			StackContext ours = getPops().get(i),
-				theirs = ic.getPops().get(i);
+			StackContext s1 = ours.pop(), s2 = theirs.pop();
 			
-			if (!ours.getPushed().equals(theirs.getPushed()))
+			if (s1.getPushed().getInstruction() != s2.getPushed().getInstruction())
 				return false;
 		}