diff --git a/build.gradle b/build.gradle
index 9a75ad2..e0cdd1d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ plugins {
 }
 
 group = 'it.fulminazzo'
-version = '1.5.11'
+version = '1.5.12'
 
 repositories {
     mavenCentral()
diff --git a/src/main/java/it/fulminazzo/yamlparser/parsers/CollectionYAMLParser.java b/src/main/java/it/fulminazzo/yamlparser/parsers/CollectionYAMLParser.java
index 0ad2b0a..b0a4ee0 100644
--- a/src/main/java/it/fulminazzo/yamlparser/parsers/CollectionYAMLParser.java
+++ b/src/main/java/it/fulminazzo/yamlparser/parsers/CollectionYAMLParser.java
@@ -33,7 +33,14 @@ public CollectionYAMLParser(@NotNull Class<C> aClass) {
         return (c, s) -> {
             if (c.isConfigurationSection(s)) {
                 @Nullable Map<Integer, T> map = mapYamlParser.load(c, s);
-                return map == null ? null : (C) map.values();
+                if (map == null) return null;
+                List<T> result = new LinkedList<>();
+                for (Integer k : map.keySet()) {
+                    if (k < 0) throw new IllegalArgumentException(String.format("Invalid number '%s'", k));
+                    while (result.size() - 1 < k) result.add(null);
+                    result.set(k, map.get(k));
+                }
+                return (C) result;
             }
             else return (C) c.getObject(s);
         };