diff --git a/src/core/Board.cpp b/src/core/Board.cpp
index 15d353e..39a344f 100644
--- a/src/core/Board.cpp
+++ b/src/core/Board.cpp
@@ -73,6 +73,10 @@ void Board::moveSnake(Direction direction) {
     m_snake->move(direction);
     const Vector2 newHeadPosition = m_snake->getHeadPosition();
 
+    if (isPositionOutside(newHeadPosition)) {
+        exit(-2);
+    }
+
     Field bumpedField = getField(newHeadPosition);
     if (bumpedField == Field::Apple) {
         putAppleOnRandomPlace();
@@ -80,9 +84,6 @@ void Board::moveSnake(Direction direction) {
     else if (bumpedField == Field::Tail) {
         exit(-1);
     }
-    else if (isPositionOutside(newHeadPosition)) {
-        exit(-2);
-    }
     else {
         Vector2 lastInTailPosition = m_snake->removeLastFromTail();
         setField(lastInTailPosition, Field::Empty);
@@ -132,6 +133,6 @@ void Board::setField(const Vector2 position, const Field field) const {
 }
 
 bool Board::isPositionOutside(Vector2 position) const {
-    return position.y < 0 || position.y >= m_sizeY
-        || position.x < 0 || position.x >= m_sizeX;
+    return position.y < 0 || static_cast<int>(position.y) >= m_sizeY
+        || position.x < 0 || static_cast<int>(position.x) >= m_sizeX;
 }