Problems with WallTile in JAVA - java

I'm trying to create a Game Engine in java, as a way of learning in a course I'm attending, and now I'm learning how to program collisions between the player and a wall. But there's one problem I haven't seen anyone having, that basically my character runs into a wall and he just stops responding. And the way I say it, it's not like the program stopped responding, it's more like leaning against a wall the controls stop working, because even though everything seems to be stopped, the FPS keeps counting.
Here are screenshots of the parts I think are most important to show for this specific issue:
enter image description here
enter image description here
Here's the file and codes on github for a deeper look:
https://github.com/TheAwesomeCake/Game-Engine.git

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