diff -urEbwB tiled-1.1.0/src/libtiled/tileset.cpp tiled-1.1.0.new/src/libtiled/tileset.cpp
--- tiled-1.1.0/src/libtiled/tileset.cpp	2018-01-03 11:57:44.000000000 +0100
+++ tiled-1.1.0.new/src/libtiled/tileset.cpp	2018-01-04 12:00:09.806029317 +0100
@@ -786,6 +786,7 @@
     case Tileset::Isometric:
         return QLatin1String("isometric");
     }
+    return QString();
 }
 
 Tileset::Orientation Tileset::orientationFromString(const QString &string)