diff --git a/src/interface.jl b/src/interface.jl
index 4dc5438..5aa26bd 100755
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -75,7 +75,7 @@ end
 
 function clearMessage(a::T)  where {T<:agent}
   for i in eachindex(a.messages)
-    if length(a.messages) > 1 # system instruction will NOT be deleted
+    if length(a.messages) > 0 
       pop!(a.messages)
     else
       break
@@ -83,6 +83,7 @@ function clearMessage(a::T)  where {T<:agent}
   end
   a.memory[:shortterm] = OrderedDict{String, Any}()
   a.memory[:log] = OrderedDict{String, Any}()
+  @show a.messages
 end
 
 function removeLatestMsg(a::T)  where {T<:agent}