diff --git a/src/main/java/net/md_5/specialsource/RemapperPreprocessor.java b/src/main/java/net/md_5/specialsource/RemapperPreprocessor.java
index babc9ee..4feb0c2 100644
--- a/src/main/java/net/md_5/specialsource/RemapperPreprocessor.java
+++ b/src/main/java/net/md_5/specialsource/RemapperPreprocessor.java
@@ -125,7 +125,9 @@ public class RemapperPreprocessor {
 
             for (MethodNode methodNode : (List<MethodNode>) classNode.methods) {
                 // Method access
-                methodNode.access = accessMap.applyMethodAccess(className, methodNode.name, methodNode.desc, methodNode.access);
+                if (accessMap != null) {
+                    methodNode.access = accessMap.applyMethodAccess(className, methodNode.name, methodNode.desc, methodNode.access);
+                }
 
                 // Reflection remapping
                 if (jarMapping != null) {