1 files changed, 9 insertions, 6 deletions

diff --git a/src/main/java/cuchaz/enigma/mapping/Mappings.java b/src/main/java/cuchaz/enigma/mapping/Mappings.java
index 307b1bd..3ef1be5 100644
--- a/src/main/java/cuchaz/enigma/mapping/Mappings.java
+++ b/src/main/java/cuchaz/enigma/mapping/Mappings.java
@@ -23,6 +23,7 @@ import cuchaz.enigma.throwables.MappingConflict;
 import java.io.File;
 import java.io.IOException;
 import java.util.*;
+import java.util.stream.Collectors;
 
 public class Mappings {
 
@@ -47,10 +48,6 @@ public class Mappings {
         }
 
         public void addClassMapping(ClassMapping classMapping) throws MappingConflict {
-                if (classMapping.isObfuscated()) {
-                        return;
-                }
-
                 if (this.classesByObf.containsKey(classMapping.getObfFullName())) {
                         throw new MappingConflict("class", classMapping.getObfFullName(), this.classesByObf.get(classMapping.getObfFullName()).getObfFullName());
                 }
@@ -217,8 +214,14 @@ public class Mappings {
 
         public void savePreviousState() {
                 this.previousState = new Mappings(this.originMapping);
-                this.previousState.classesByDeobf = Maps.newHashMap(this.classesByDeobf);
-                this.previousState.classesByObf = Maps.newHashMap(this.classesByObf);
+                this.previousState.classesByDeobf = new HashMap<>();
+                for (Map.Entry<String, ClassMapping> entry : this.classesByDeobf.entrySet()) {
+                        this.previousState.classesByDeobf.put(entry.getKey(), entry.getValue().copy());
+                }
+                this.previousState.classesByObf = new HashMap<>();
+                for (Map.Entry<String, ClassMapping> entry : this.classesByObf.entrySet()) {
+                        this.previousState.classesByObf.put(entry.getKey(), entry.getValue().copy());
+                }
                 classesByDeobf.values().forEach(ClassMapping::resetDirty);
                 classesByObf.values().forEach(ClassMapping::resetDirty);
         }