diff --git a/lorahandler.go b/lorahandler.go
index add14f7..cbcccd6 100644
--- a/lorahandler.go
+++ b/lorahandler.go
@@ -341,13 +341,15 @@ func WriteDatapoint(mytime int64, deveui string, devaddr string, v uint8, h uint
 		WriteStringToFile(s, deveui, implausible)
 
 		w_gram := uint32(w) * 5
-		addValue(deveui, w_gram)
-		w_loss := getMaxValue(deveui) - w_gram
-		if w_loss > 750 && IsDayTime() {
-			// Schwarmalarm!
-			alertLogMap[deveui] = fmt.Sprintf("alert,deveui=%s reason=\"swarmalarm\",w=%di,w_loss=%di %d\n", deveui, w_gram, w_loss, mytime*60*1000*1000*1000)
-			location, _ := time.LoadLocation("Europe/Zurich")
-			alertMap[deveui] = fmt.Sprintf("*** Schwarmalarm ***\n%s\n%s\nGewichtsverlust: %d g", getDevAlias(deveui), time.Unix(mytime*60, 0).In(location).Format("02.01.2006 15:04"), w_loss)
+		if !implausible {
+			addValue(deveui, w_gram)
+			w_loss := getMaxValue(deveui) - w_gram
+			if w_loss > 750 && IsDayTime() {
+				// Schwarmalarm!
+				alertLogMap[deveui] = fmt.Sprintf("alert,deveui=%s reason=\"swarmalarm\",w=%di,w_loss=%di %d\n", deveui, w_gram, w_loss, mytime*60*1000*1000*1000)
+				location, _ := time.LoadLocation("Europe/Zurich")
+				alertMap[deveui] = fmt.Sprintf("*** Schwarmalarm ***\n%s\n%s\nGewichtsverlust: %d g", getDevAlias(deveui), time.Unix(mytime*60, 0).In(location).Format("02.01.2006 15:04"), w_loss)
+			}
 		}
 	}
 }