diff --git a/pandalib-paper/src/main/java/fr/pandacube/lib/paper/players/PaperOffPlayer.java b/pandalib-paper/src/main/java/fr/pandacube/lib/paper/players/PaperOffPlayer.java
index 8d8bfff..6cf7684 100644
--- a/pandalib-paper/src/main/java/fr/pandacube/lib/paper/players/PaperOffPlayer.java
+++ b/pandalib-paper/src/main/java/fr/pandacube/lib/paper/players/PaperOffPlayer.java
@@ -155,10 +155,11 @@ public interface PaperOffPlayer extends AbstractOffPlayer {
      * Gets the NBT data from the player-data file.
      * It will not work if the player is online, because the data on the file are not synchronized with real-time values.
      * @param convertTag true to convert the data to the current MC version, false to keep the saved version
-     * @return the NBT data from the player-data file.
+     * @return the NBT data from the player-data file, or null if the file does not exists.
      * @throws IllegalStateException if the player is online.
+     * @throws IOException if an error occurs reading the data.
      */
-    default CompoundTag getPlayerData(boolean convertTag) {
+    default CompoundTag getPlayerData(boolean convertTag) throws IOException {
         if (isOnline())
             throw new IllegalStateException("Cannot access data file of " + getName() + " because they’re online.");
         CompoundTag data = ReflectWrapper.wrapTyped(Bukkit.getServer(), CraftServer.class)
@@ -166,13 +167,13 @@ public interface PaperOffPlayer extends AbstractOffPlayer {
                 .getPlayerList()
                 .playerIo()
                 .getPlayerData(getUniqueId().toString());
-        if (convertTag) {
+        if (data != null && convertTag) {
             int srcVersion = data.contains("DataVersion", Tag.TAG_ANY_NUMERIC()) ? data.getInt("DataVersion") : -1;
             int destVersion = SharedConstants.getCurrentVersion().getDataVersion().getVersion();
             try {
                 data = MCDataConverter.convertTag(MCTypeRegistry.PLAYER(), data, srcVersion, destVersion);
             } catch (Exception e) {
-                throw new RuntimeException("Unable to upgrade data format of player " + getName() + " (" + getUniqueId() + ") from version " + destVersion + " to " + destVersion);
+                throw new IOException("Unable to upgrade data format of player " + getName() + " (" + getUniqueId() + ") from version " + destVersion + " to " + destVersion);
             }
         }
         return data;
@@ -183,8 +184,9 @@ public interface PaperOffPlayer extends AbstractOffPlayer {
      * It will not work if the player is online, because the data on the file are not synchronized with real-time values.
      * @return the NBT data from the player-data file.
      * @throws IllegalStateException if the player is online.
+     * @throws IOException if an error occurs reading the data.
      */
-    default PlayerDataWrapper getPlayerDataWrapper() {
+    default PlayerDataWrapper getPlayerDataWrapper() throws IOException {
         return new PlayerDataWrapper(getPlayerData(true));
     }
 
@@ -218,16 +220,18 @@ public interface PaperOffPlayer extends AbstractOffPlayer {
     /**
      * Gets the player’s inventory.
      * @return the player’s inventory.
+     * @throws IOException if an error occurs reading the data.
      */
-    default PlayerInventory getInventory() {
+    default PlayerInventory getInventory() throws IOException {
         return getPlayerDataWrapper().getInventory();
     }
 
     /**
      * Gets the player’s enderchest.
      * @return the player’s enderchest.
+     * @throws IOException if an error occurs reading the data.
      */
-    default Inventory getEnderChest() {
+    default Inventory getEnderChest() throws IOException {
         return getPlayerDataWrapper().getEnderChest();
     }