diff --git a/pvAccessApp/remote/codec.cpp b/pvAccessApp/remote/codec.cpp
index df3bb2c..4c1c57b 100644
--- a/pvAccessApp/remote/codec.cpp
+++ b/pvAccessApp/remote/codec.cpp
@@ -194,6 +194,9 @@ namespace epics {
             }
             catch(...)
             {
+                if (!isOpen())
+                  return;
+
                 if (postProcess)
                 {
                     postProcessApplicationMessage();