Fix deserialization problems

build.gradle

@@ -6,7 +6,7 @@ plugins {
 }
 
 group 'sh.okx'
-version '3.13'
+version '3.13.1'
 
 java {
     sourceCompatibility = JavaVersion.VERSION_1_8

src/main/java/sh/okx/rankup/ranksgui/RanksGui.java

@@ -35,9 +35,9 @@ public class RanksGui {
         ConfigurationSection basePath = plugin.getMessages().getConfigurationSection("rankup.ranksgui");
 
         String title = get(ConfigurationSection::getString, "title", playerPath, basePath, "Ranks");
-        int rows = get(ConfigurationSection::getInt, "rows", playerPath, basePath, 3);
-        int offset = get(ConfigurationSection::getInt, "offset", playerPath, basePath, 10);
-        int width = get(ConfigurationSection::getInt, "width", playerPath, basePath, 7);
+        int rows = get(this::getInt, "rows", playerPath, basePath, 3);
+        int offset = get(this::getInt, "offset", playerPath, basePath, 10);
+        int width = get(this::getInt, "width", playerPath, basePath, 7);
 
         inventory = Bukkit.createInventory(null, rows * 9, Colour.translate(title));
 
@@ -87,6 +87,19 @@ public class RanksGui {
         player.openInventory(inventory);
     }
 
+    private Integer getInt(ConfigurationSection section, String key) {
+        String string = section.getString(key);
+        if (string == null) {
+            return null;
+        } else {
+            try {
+                return Integer.parseInt(string);
+            } catch (IllegalArgumentException ex) {
+                return null;
+            }
+        }
+    }
+
     private <T> T get(BiFunction<ConfigurationSection, String, T> fun, String path, ConfigurationSection primary, ConfigurationSection secondary, T def) {
         T get = null;
         if (primary != null) {

src/main/java/sh/okx/rankup/serialization/ShadowDeserializer.java

@@ -57,10 +57,12 @@ public class ShadowDeserializer {
   private static void updateMap(Map<String, String> map, UnmodifiableConfig config, String prefix) {
     for (Entry message : config.entrySet()) {
       Object value = message.getValue();
-      if (value instanceof String) {
-        map.put(prefix + message.getKey(), (String) value);
-      } else if (value instanceof UnmodifiableConfig) {
+      if (value != null) {
+        if (value instanceof UnmodifiableConfig) {
           updateMap(map, (UnmodifiableConfig) value, prefix + message.getKey() + ".");
+        } else {
+          map.put(prefix + message.getKey(), String.valueOf(value));
+        }
       }
     }
   }

src/main/java/sh/okx/rankup/serialization/YamlDeserializer.java

@@ -43,8 +43,10 @@ public class YamlDeserializer {
         Set<String> rankup = rankupSection.getKeys(true);
         messages = new HashMap<>(rankup.size());
         for (String key : rankup) {
+          if (!rankupSection.isConfigurationSection(key)) {
             messages.put(MemorySection.createPath(rankupSection, key, section), rankupSection.getString(key));
           }
+        }
       } else {
         messages = Collections.emptyMap();
       }