diff --git a/RTCP/Cobalt/OutputProc/src/MeasurementSetFormat.cc b/RTCP/Cobalt/OutputProc/src/MeasurementSetFormat.cc
index dac5383e4f9bc786cb312488b4408b48a60e3079..6439e976674fbfe93239a2be55214fd2c687f159 100644
--- a/RTCP/Cobalt/OutputProc/src/MeasurementSetFormat.cc
+++ b/RTCP/Cobalt/OutputProc/src/MeasurementSetFormat.cc
@@ -119,6 +119,9 @@ namespace LOFAR
 
     MeasurementSetFormat::~MeasurementSetFormat()
     {
+      ScopedLock scopedLock(sharedMutex);
+
+      itsMS = 0;
     }
 
 
@@ -132,6 +135,9 @@ namespace LOFAR
       /// Next make a metafile which describes the raw datafile we're
       /// going to write
       createMSMetaFile(MSname, subband);
+
+      // Release itsMS, we don't need it anymore
+      itsMS = 0;
     }
 
 
diff --git a/RTCP/Cobalt/OutputProc/src/OutputThread.cc b/RTCP/Cobalt/OutputProc/src/OutputThread.cc
index e972dfdc5ac9e658b957092c23c0fd19fd15fafd..689d8396545b905a1430fda569650cd100236dbc 100644
--- a/RTCP/Cobalt/OutputProc/src/OutputThread.cc
+++ b/RTCP/Cobalt/OutputProc/src/OutputThread.cc
@@ -172,6 +172,15 @@ namespace LOFAR
 
         if (!itsParset.settings.realTime)   
           THROW(StorageException, ex); 
+#if defined HAVE_AIPSPP
+      } 
+      catch (casa::AipsError &ex)
+      {
+        LOG_ERROR_STR(itsLogPrefix << "Could not create meta data (AipsError): " << ex.what());
+
+        if (!itsParset.settings.realTime)    
+          THROW(StorageException, ex.what()); 
+#endif
       }
     }
 
@@ -188,6 +197,15 @@ namespace LOFAR
 
         if (!itsParset.settings.realTime)   
           THROW(StorageException, ex); 
+#if defined HAVE_AIPSPP
+      } 
+      catch (casa::AipsError &ex)
+      {
+        LOG_ERROR_STR(itsLogPrefix << "Could not add final meta data (AipsError): " << ex.what());
+
+        if (!itsParset.settings.realTime)    
+          THROW(StorageException, ex.what()); 
+#endif
       }
     }