diff --git a/container/statssum.go b/container/statssum.go
index 9bad1438..8254b968 100644
--- a/container/statssum.go
+++ b/container/statssum.go
@@ -73,9 +73,14 @@ func (self *statsSummaryContainerHandlerWrapper) GetStats() (*info.ContainerStat
 	self.lock.Lock()
 	defer self.lock.Unlock()
 
-	sample, _ := info.NewSample(self.prevStats, stats)
-	if sample != nil {
-		self.sampler.Update(sample)
+	if self.prevStats != nil {
+		sample, err := info.NewSample(self.prevStats, stats)
+		if err != nil {
+			return nil, fmt.Errorf("wrong stats: %v", err)
+		}
+		if sample != nil {
+			self.sampler.Update(sample)
+		}
 	}
 	self.updatePrevStats(stats)
 	if self.currentSummary == nil {