1 files changed, 4 insertions, 1 deletions

diff --git a/enigma/src/main/java/cuchaz/enigma/translation/mapping/serde/MappingIoConverter.java b/enigma/src/main/java/cuchaz/enigma/translation/mapping/serde/MappingIoConverter.java
index 3843d8e..b7696d2 100644
--- a/enigma/src/main/java/cuchaz/enigma/translation/mapping/serde/MappingIoConverter.java
+++ b/enigma/src/main/java/cuchaz/enigma/translation/mapping/serde/MappingIoConverter.java
@@ -71,7 +71,10 @@ public class MappingIoConverter {
                 Deque<String> parts = new LinkedList<>();
 
                 newMappingTree.visitClass(classEntry.getFullName());
-                newMappingTree.visitComment(MappedElementKind.CLASS, mapping.javadoc());
+
+                if (mapping != null) {
+                        newMappingTree.visitComment(MappedElementKind.CLASS, mapping.javadoc());
+                }
 
                 do {
                         mapping = oldMappingTree.get(classEntry);