Summary:

When clicking the auto-upgrade function on artifacts, tabbing out will sometimes cause the game to continue upgrade attempts (and spending the corresponding coins) even beyond the level selected to upgrade to. It happened a couple times within the past few days, but I tabbed back into my game in time to notice and cancel some of the extra upgrade attempts. In the most recent incident, however, I only wanted to upgrade a mediocre piece of common equipment to level 4, but because I tabbed out it continued to upgrade until my coins ran out (approximately 150k-200k, don't recall exactly how many). When I tabbed back into the game, the game notified me of a crash and recommended I create this bug report. Upon closing and reopening the game and navigating back to the armor piece, I realized this common 1-star chestplate was now level 14 and I had run out of silver coins. Being a noob (started roughly a week ago), 200k coins is a significant amount of currency to lose this early in the game and very discouraging towards continued play.

Platform: PC running Windows 10 (app running in windowed mode)

Steps to reproduce:

1. Select a piece of equipment (it may need to be equipped to a unit, but I don't believe the type of unit matters).

2. Change the auto-upgrade attempts to 4 or greater.

3. Click on auto upgrade to begin upgrade attempts, and click to a different window so that it upgrades in the background.

4. Wait enough time for the upgrade attempts to complete (i.g. if you selected 4 upgrade levels, wait at least until 5 upgrades should be completed).

5. Click the application icon on the taskbar to tab back into the game.

6. Notice artifact level and the corresponding (undesired) coin-loss.

Some screenshots:

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This has happened on multiple artifacts equipped on multilple characters, but in case some other info may be relevant:

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