Fixed CID 1366366, CID 1366367, CID 1366368, CID 1366369, CID 1366370, CID 1366372

client/windows/CCreatureWindow.cpp

@@ -818,6 +818,9 @@ void CStackWindow::initBonusesList()
 
 void CStackWindow::init()
 {
+	expRankIcon = nullptr;
+	expArea = nullptr;
+	expLabel = nullptr;
 	if (!info->stackNode)
 		info->stackNode = new CStackInstance(info->creature, 1);// FIXME: free data