Ah yes

src/main/kotlin/ru/dbotthepony/mc/otm/client/ClientEventHandler.kt

@@ -243,6 +243,7 @@ fun onMouseScrolled(event: ScreenEvent.MouseScrolled.Pre) {
 }
 
 fun onPostScreenInit(event: ScreenEvent.Init.Post) {
+	if (!LOGGED_IN) return
 	inventoryLogic(event)
 	onceClient {
 		exosuitInventoryLogic(event.screen, event::addListener)

src/main/kotlin/ru/dbotthepony/mc/otm/client/screen/tech/EssenceStorageScreen.kt

@@ -61,10 +61,7 @@ class EssenceStorageScreen(menu: EssenceStorageMenu, inventory: Inventory, title
 					BAR_BACKGROUND.render(graphics, canvasWidth = width, canvasHeight = height)
 					val level = getLevelFromXp(menu.experienceStored)
 
-					val progress = if (level <= 0)
-						menu.experienceStored  / getXpRequiredForLevelUp(level).toDouble()
-					else
-						(menu.experienceStored - getTotalXpRequiredForLevel(level - 1)).toDouble() / getXpRequiredForLevelUp(level).toDouble()
+					val progress = (menu.experienceStored - getTotalXpRequiredForLevel(level)).toDouble() / getXpRequiredForLevelUp(level + 1).toDouble()
 
 					BAR_FOREGROUND.renderPartial(graphics, width = width * progress.toFloat(), height = height)
 				}