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This bug occurs when a player's Hero gains a non-existent skill, and clicking on it causes the game to crash.
I have encountered this situation in online games.
As shown in the screenshot, Kirr has a new secondary skill, which appears as the "Wisdom" icon, but the description says "Magic Resistance."
The cause of this bug is *presumably* as follows:
Our Hero (Kirr) is defending against an attack on a castle. Inside the castle are centaurs, elves, dwarves, etc., while Kirr is outside the castle, on the ramparts, let's say with 3 angels.
If these 3 angels are killed during the defense, but the defending hero wins, then, firstly, the hero will move inside the castle after the battle, and if he gained a level during the battle, the message with the skill selection will not appear, but the mentioned "glitchy" skill will appear instead.