diff --git a/Source/path.cpp b/Source/path.cpp
index ac365f0e9..f8e92bb0f 100644
--- a/Source/path.cpp
+++ b/Source/path.cpp
@@ -285,6 +285,10 @@ bool GetPath(const std::function<bool(Point)> &posOk, PATHNODE *pPath, Point des
 
 bool IsTileNotSolid(Point position)
 {
+	if (position.x < 0 || position.y < 0 || position.x >= MAXDUNX || position.y >= MAXDUNY) {
+		return false;
+	}
+
 	return !nSolidTable[dPiece[position.x][position.y]];
 }