diff --git a/DESCRIPTION b/DESCRIPTION
index 7a4d3b57a319e3488c4e1e26050cacd8134cc257..a951387893715a61b4dfcfd9a868f6dcb03702d4 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: airGR
 Type: Package
 Title: Suite of GR Hydrological Models for Precipitation-Runoff Modelling
-Version: 1.0.9.35
+Version: 1.0.9.36
 Date: 2017-09-05
 Authors@R: c(
   person("Laurent", "Coron", role = c("aut", "trl")),
diff --git a/R/plot.OutputsModel.R b/R/plot.OutputsModel.R
index 6249041f3c82835963d5d7d1b7276756479adda7..0b93be4824bca255ee85addaa1984a5c3f7bbd64 100644
--- a/R/plot.OutputsModel.R
+++ b/R/plot.OutputsModel.R
@@ -20,7 +20,7 @@ plot.OutputsModel <- function(x, Qobs = NULL, IndPeriod_Plot = NULL, BasinArea =
         if (sum(is.na(Qobs)) != length(Qobs)) {
           BOOL_Qobs <- TRUE
         }
-      } else {
+      } else if (inherits(OutputsModel, "GR")) {
         warning("Incorrect length of Qobs. Time series of observed flow not drawn.")
       }
   BOOL_Snow <- FALSE;