diff --git a/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/ModifyMethodParams.java b/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/ModifyMethodParams.java
index 8f2dcc9..da6efe5 100644
--- a/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/ModifyMethodParams.java
+++ b/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/ModifyMethodParams.java
@@ -14,6 +14,7 @@
 import dev.su5ed.sinytra.adapter.patch.fixes.BytecodeFixerUpper;
 import dev.su5ed.sinytra.adapter.patch.fixes.TypeAdapter;
 import dev.su5ed.sinytra.adapter.patch.selector.AnnotationHandle;
+import dev.su5ed.sinytra.adapter.patch.transformer.param.ParameterTransformer;
 import dev.su5ed.sinytra.adapter.patch.util.AdapterUtil;
 import dev.su5ed.sinytra.adapter.patch.util.LocalVariableLookup;
 import dev.su5ed.sinytra.adapter.patch.util.MethodQualifier;
@@ -185,8 +186,8 @@ public Result apply(ClassNode classNode, MethodNode methodNode, MethodContext me
                 LOGGER.info("Substituting parameter {} for {} in {}.{}", paramIndex, substituteParamIndex, classNode.name, methodNode.name);
                 methodNode.parameters.remove(paramIndex);
                 newParameterTypes.remove(paramIndex);
-                int substituteIndex = calculateLVTIndex(newParameterTypes, isNonStatic, substituteParamIndex);
                 methodNode.localVariables.removeIf(lvn -> lvn.index == localIndex);
+                int substituteIndex = ParameterTransformer.calculateLocalLVTIndex(methodNode.localVariables, isNonStatic, substituteParamIndex);
                 for (AbstractInsnNode insn : methodNode.instructions) {
                     SingleValueHandle<Integer> handle = AdapterUtil.handleLocalVarInsnValue(insn);
                     if (handle == null) continue;
diff --git a/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/param/ParameterTransformer.java b/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/param/ParameterTransformer.java
index 585b993..58c08ed 100644
--- a/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/param/ParameterTransformer.java
+++ b/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/param/ParameterTransformer.java
@@ -16,6 +16,7 @@
 import org.objectweb.asm.tree.*;
 
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -238,6 +239,17 @@ static int calculateLVTIndex(List<Type> parameters, boolean nonStatic, int index
         return lvt;
     }
 
+    static int calculateLocalLVTIndex(List<LocalVariableNode> locals, boolean nonStatic, int index) {
+        locals = new ArrayList<>(locals);
+        locals.sort(Comparator.comparing(l -> l.index));
+        if (nonStatic) locals.remove(0);
+        int lvt = nonStatic ? 1 : 0;
+        for (int i = 0; i < index; i++) {
+            lvt += Type.getType(locals.get(i).desc).getSize();
+        }
+        return lvt;
+    }
+
     default Codec<? extends ParameterTransformer> codec() {
         throw new UnsupportedOperationException("This transform is not serializable");
     }
diff --git a/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/param/SubstituteParameterTransformer.java b/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/param/SubstituteParameterTransformer.java
index 9c8f0b6..7983862 100644
--- a/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/param/SubstituteParameterTransformer.java
+++ b/definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/param/SubstituteParameterTransformer.java
@@ -27,7 +27,7 @@ public Patch.Result apply(ClassNode classNode, MethodNode methodNode, MethodCont
         final int paramIndex = this.target + offset;
         final int substituteParamIndex = this.substitute + offset;
         final boolean isNonStatic = !methodContext.isStatic(methodNode);
-        final int localIndex = ParameterTransformer.calculateLVTIndex(parameters, isNonStatic, paramIndex);
+        final int localIndex = ParameterTransformer.calculateLocalLVTIndex(methodNode.localVariables, isNonStatic, paramIndex);
 
         if (methodNode.parameters.size() <= paramIndex) {
             return Patch.Result.PASS;
@@ -35,11 +35,13 @@ public Patch.Result apply(ClassNode classNode, MethodNode methodNode, MethodCont
 
         withLVTSnapshot(methodNode, () -> {
             LOGGER.info("Substituting parameter {} for {} in {}.{}", paramIndex, substituteParamIndex, classNode.name, methodNode.name);
-            parameters.remove(paramIndex);
-            methodNode.parameters.remove(paramIndex);
-            methodNode.localVariables.removeIf(lvn -> lvn.index == localIndex);
+            if (paramIndex < parameters.size()) {
+                parameters.remove(paramIndex);
+                methodNode.parameters.remove(paramIndex);
+            }
 
-            final int substituteIndex = ParameterTransformer.calculateLVTIndex(parameters, isNonStatic, substituteParamIndex);
+            final int substituteIndex = ParameterTransformer.calculateLocalLVTIndex(methodNode.localVariables, isNonStatic, substituteParamIndex);
+            methodNode.localVariables.removeIf(lvn -> lvn.index == localIndex);
             AdapterUtil.replaceLVT(methodNode, idx -> idx == localIndex ? substituteIndex : idx);
         });