Add forced early engine init stage check

base/src/main/java/de/staropensource/engine/base/utility/FileAccess.java

@@ -176,11 +176,13 @@ public final class FileAccess {
     /**
      * Initializes all uninitialized static
      * {@link FileAccess} instances.
+     * <p>
+     * Only works during early engine startup.
      *
      * @since v1-alpha8
      */
     public static void initializeInstances() throws IOException {
-        if (cacheDirectory == null) {
+        if (Engine.getInstance().getState() == EngineState.EARLY_STARTUP) {
             String temp = System.getProperty("os.name").toLowerCase(Locale.ROOT);
 
             if (temp.contains("nix") || temp.contains("nux") || temp.contains("aix") || temp.contains("bsd"))
@@ -197,6 +199,7 @@ public final class FileAccess {
     }
     /**
      * Deletes all files scheduled for deletion.
+     * <p>
      * Only works during engine shutdown.
      *
      * @since v1-alpha8