diff --git a/main.go b/main.go
index 41fb056..1c17e19 100644
--- a/main.go
+++ b/main.go
@@ -40,6 +40,10 @@ func SpawnShape() {
 func LockShape() {
 	for _, block := range shape.Coordinates() {
 		block = shape_pos.Add(block)
+		// Check bounds
+		if block.X < 0 || block.X > int8(grid.Width()) || block.Y < 0 || block.Y > int8(grid.Height()) {
+			continue
+		}
 		grid.Set(byte(block.X), byte(block.Y), shape.GetBlock())
 	}
 }