Fix possible NPE in MappingIoConverter

2 files changed, 5 insertions, 2 deletions

diff --git a/build.gradle b/build.gradle
index 8c2461bf..81412dfc 100644
--- a/build.gradle
+++ b/build.gradle
@@ -26,7 +26,7 @@ subprojects {
         }
 
         group = 'cuchaz'
-        version = '2.4.0'
+        version = '2.4.1'
 
         version = version + (System.getenv("GITHUB_ACTIONS") ? "" : "+local")
 
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 3843d8e4..b7696d2d 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);