diff --git a/.travis.yml b/.travis.yml
index 749789a62..4e0ef6ecf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,6 +40,7 @@ cache:
   directories:
     - $HOME/Library/Caches/Homebrew
     - $HOME/vcglib
+    - $HOME/meshlab/src/external/lib/macx64
 script:
   - if [[ "$TRAVIS_OS_NAME" == "osx"   ]]; then PATH="/usr/local/opt/llvm/bin:$PATH"          ;fi
   - if [[ "$TRAVIS_OS_NAME" == "osx"   ]]; then which clang             ;fi
diff --git a/src/meshlabplugins/io_base/baseio.cpp b/src/meshlabplugins/io_base/baseio.cpp
index 82890c8b4..178d71928 100644
--- a/src/meshlabplugins/io_base/baseio.cpp
+++ b/src/meshlabplugins/io_base/baseio.cpp
@@ -297,7 +297,7 @@ bool BaseMeshIOPlugin::save(const QString &formatName, const QString &fileName,
 			}
 			else if (pname.startsWith("PVA3F")){				// if pname starts with PVA3F, it is a PLY per-vertex point3f custom attribute
 				if (par.findParameter(pname)->val->getBool())	// if it is true, add to save list
-					pi.AddPerVertexPoint3fAttribute(m, qUtf8Printable(pname.mid(5)));
+					pi.AddPerVertexPoint3fAttribute(m.cm, qUtf8Printable(pname.mid(5)));
 			}
 			else if (pname.startsWith("PFAF")){					// if pname starts with PFAF, it is a PLY per-face float custom attribute
 				if (par.findParameter(pname)->val->getBool())	// if it is true, add to save list