diff -r b6824a53d4b1 -r 4409344db447 rust/lib-hedgewars-engine/src/lib.rs
--- a/rust/lib-hedgewars-engine/src/lib.rs	Fri Dec 07 13:56:45 2018 +0100
+++ b/rust/lib-hedgewars-engine/src/lib.rs	Fri Dec 07 14:30:35 2018 +0100
@@ -42,14 +42,19 @@
 
     (*engine_state).world.generate_preview();
 
-    let land_preview = (*engine_state).world.preview();
+    if let Some(land_preview) = (*engine_state).world.preview() {
+        *preview = PreviewInfo {
+            width: land_preview.width() as u32,
+            height: land_preview.height() as u32,
+            hedgehogs_number: 0,
+            land: land_preview.raw_pixels().as_ptr(),
+        };
+    }
+}
 
-    *preview = PreviewInfo {
-        width: land_preview.width() as u32,
-        height: land_preview.height() as u32,
-        hedgehogs_number: 0,
-        land: land_preview.raw_pixels().as_ptr(),
-    };
+#[no_mangle]
+pub extern "C" fn dispose_preview(engine_state: &mut EngineInstance, preview: &mut PreviewInfo) {
+    (*engine_state).world.dispose_preview();
 }
 
 #[no_mangle]