diff --git a/Core/Src/lcd.c b/Core/Src/lcd.c
index 7e70a0b..a7674c4 100644
--- a/Core/Src/lcd.c
+++ b/Core/Src/lcd.c
@@ -139,6 +139,9 @@ static void display_write_data_byte_framebuffer(uint8_t code)
 	if (display_current_frame >= DISPLAY_FRAMES_AVAILABLE)
 		return;
 
+	if (((int) des.cursor_offset >= 32) || ((int) des.cursor_offset < 0))
+		return;
+
 	display_framebuffer[16*2*display_current_frame + des.cursor_offset] = (char) code;
 	des.cursor_offset += des.next ? -1 : 1;
 }