Fix NPE

src/main/java/com/raoulvdberge/refinedstorage/screen/KeyInputListener.java

@@ -22,6 +22,7 @@ import java.util.function.Consumer;
 public class KeyInputListener {
     @SubscribeEvent
     public void onKeyInput(InputEvent.KeyInputEvent e) {
+        if (Minecraft.getInstance().player != null) {
             PlayerInventory inv = Minecraft.getInstance().player.inventory;
 
             if (RSKeyBindings.OPEN_WIRELESS_GRID.isKeyDown()) {
@@ -34,6 +35,7 @@ public class KeyInputListener {
                 findAndOpen(inv, RSItems.WIRELESS_CRAFTING_MONITOR);
             }*/
         }
+    }
 
     private void findAndOpen(IInventory inv, Consumer<ITextComponent> onError, Item... items) {
         Set<Item> validItems = new HashSet<>(Arrays.asList(items));