diff --git a/src/client/clientMonitor.cpp b/src/client/clientMonitor.cpp
index 6168eb7..55f6b9c 100644
--- a/src/client/clientMonitor.cpp
+++ b/src/client/clientMonitor.cpp
@@ -207,7 +207,7 @@ bool Monitor::poll()
     if(!impl) return false;
     Guard G(impl->mutex);
 
-    if(!impl->done && impl->op && impl->last && impl->last.next()) {
+    if(!impl->done && impl->op && impl->started && impl->last.next()) {
         const epics::pvData::PVStructurePtr& ptr = impl->last->pvStructurePtr;
         changed = *impl->last->changedBitSet;
         overrun = *impl->last->overrunBitSet;