1 files changed, 3 insertions, 0 deletions
diff --git a/src/main/java/io/github/moulberry/repo/constants/Parents.java b/src/main/java/io/github/moulberry/repo/constants/Parents.java
index cd1d770..7478ee0 100644
--- a/src/main/java/io/github/moulberry/repo/constants/Parents.java
+++ b/src/main/java/io/github/moulberry/repo/constants/Parents.java
@@ -12,6 +12,7 @@ public class Parents {
 
     public Parents(Map<String, List<String>> parents) {
         this.parents = parents;
+        if (parents == null) return;
         for (Map.Entry<String, List<String>> parentings : parents.entrySet()) {
             String parent = parentings.getKey();
             for (String child : parentings.getValue()) {
@@ -21,10 +22,12 @@ public class Parents {
     }
 
     public List<String> getChildren(String itemId) {
+        if (reverseParents == null) return new ArrayList<>();
         return parents.getOrDefault(itemId, new ArrayList<>());
     }
 
     public Optional<String> getParent(String itemId) {
+        if (reverseParents == null) return Optional.empty();
         return reverseParents.containsKey(itemId)
                 ? Optional.of(reverseParents.get(itemId))
                 : Optional.empty();