diff --git a/definition/src/main/java/org/sinytra/adapter/patch/transformer/dynamic/DynamicInjectorOrdinalPatch.java b/definition/src/main/java/org/sinytra/adapter/patch/transformer/dynamic/DynamicInjectorOrdinalPatch.java
index 2caca77..a1375d2 100644
--- a/definition/src/main/java/org/sinytra/adapter/patch/transformer/dynamic/DynamicInjectorOrdinalPatch.java
+++ b/definition/src/main/java/org/sinytra/adapter/patch/transformer/dynamic/DynamicInjectorOrdinalPatch.java
@@ -170,7 +170,7 @@ public Optional<Integer> apply(MethodContext methodContext, ClassNode classNode,
             List<AbstractInsnNode> cleanReturnInsns = findReturnInsns(cleanTarget.methodNode());
             List<AbstractInsnNode> dirtyReturnInsns = findReturnInsns(dirtyTarget.methodNode());
 
-            if (ordinal < cleanReturnInsns.size()) {
+            if (ordinal < cleanReturnInsns.size() && cleanReturnInsns.size() != dirtyReturnInsns.size()) {
                 AbstractInsnNode cleanInsn = cleanReturnInsns.get(ordinal);
                 InstructionMatcher original = new InstructionMatcher(cleanInsn, findReturnPrecedingInsns(cleanInsn), List.of());
                 List<InstructionMatcher> dirtyMatchers = dirtyReturnInsns.stream()
diff --git a/definition/src/main/java/org/sinytra/adapter/patch/transformer/dynamic/DynamicModifyVarAtReturnPatch.java b/definition/src/main/java/org/sinytra/adapter/patch/transformer/dynamic/DynamicModifyVarAtReturnPatch.java
index d32d765..52e0233 100644
--- a/definition/src/main/java/org/sinytra/adapter/patch/transformer/dynamic/DynamicModifyVarAtReturnPatch.java
+++ b/definition/src/main/java/org/sinytra/adapter/patch/transformer/dynamic/DynamicModifyVarAtReturnPatch.java
@@ -145,7 +145,11 @@ private static Pair<AbstractInsnNode, Integer> getTargetPair(ClassNode classNode
         if (targetInsns.isEmpty()) {
             return null;
         }
-        AbstractInsnNode targetInsn = targetInsns.get(ordinal == -1 ? targetInsns.size() - 1 : ordinal);
+        int index = ordinal == -1 ? targetInsns.size() - 1 : ordinal;
+        if (index >= targetInsns.size()) {
+            return null;
+        }
+        AbstractInsnNode targetInsn = targetInsns.get(index);
         // Find modified variable
         LocalVariableDiscriminator discriminator = LocalVariableDiscriminator.parse(methodContext.methodAnnotation().unwrap());
         InjectionInfo injectionInfo = MockMixinRuntime.forInjectionInfo(classNode.name, injectionTarget.classNode().name, context.environment());