diff --git a/Assets/LDtkUnity/CHANGELOG.md b/Assets/LDtkUnity/CHANGELOG.md
index 7f58a0b25..1d31cb553 100644
--- a/Assets/LDtkUnity/CHANGELOG.md
+++ b/Assets/LDtkUnity/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 4.0.2
+###### September 28, 2023
+- Added safety-check if a tileset definition's relPath was null or empty
+
 # 4.0.1
 ###### September 28, 2023
 - Updated json support for [LDtk 1.4](https://ldtk.io/json/#changes;1.4.0)
diff --git a/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkTilesetImporter.cs b/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkTilesetImporter.cs
index 2cdc95a77..3e09ce7a9 100644
--- a/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkTilesetImporter.cs
+++ b/Assets/LDtkUnity/Editor/ScriptedImporter/LDtkTilesetImporter.cs
@@ -83,6 +83,7 @@ private static string[] GatherDependenciesFromSourceFile(string path)
             }
 
             //this depends on the texture
+            //todo add a digger for getting the RelPath
             LDtkProfiler.BeginSample($"GatherDependenciesFromSourceFile/{Path.GetFileName(path)}");
             string texPath = PathToTexture(path);
             texPath = !File.Exists(texPath) ? string.Empty : texPath;
@@ -408,8 +409,14 @@ private bool DeserializeAndAssign()
                 return false;
             }
             
+            if (_json.RelPath.IsNullOrEmpty())
+            {
+                Logger.LogError($"The tileset relative path was null or empty! Try fixing the Tileset path in the LDtk editor for \"{assetPath}\"");
+                return false;
+            }
+            
             Profiler.BeginSample("GetTextureImporter");
-            string path = PathToTexture(assetPath);
+            string path = PathToTexture(assetPath, _json);
 
             if (LDtkRelativeGetterTilesetTexture.IsAsepriteAsset(path))
             {
@@ -452,9 +459,13 @@ private bool DeserializeAndAssign()
         /// <summary>
         /// Only use when needed, it performs a deserialize. look at optimizing if it's expensive
         /// </summary>
-        private static string PathToTexture(string assetPath)
+        private static string PathToTexture(string assetPath, TilesetDefinition def = null)
         {
-            TilesetDefinition def = FromJson<LDtkTilesetDefinition>(assetPath).Def;
+            if (def == null)
+            {
+                def = FromJson<LDtkTilesetDefinition>(assetPath).Def;
+            }
+            
             if (def.IsEmbedAtlas)
             {
                 string iconsPath = LDtkProjectSettings.InternalIconsTexturePath;
@@ -553,7 +564,7 @@ private bool HasTextureIssue(TextureImporter textureImporter, TextureImporterPla
 
         private Texture2D LoadTex(bool forceLoad = false)
         {
-            //in case the importer was destroyed via file delete
+            //this is important: in case the importer was destroyed via file delete
             if (this == null)
             {
                 return null;