diff --git a/Project.toml b/Project.toml
index 6889a7aa..60580da0 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "MLJBase"
 uuid = "a7f614a8-145f-11e9-1d2a-a57a1082229d"
 authors = ["Anthony D. Blaom <anthony.blaom@gmail.com>"]
-version = "0.14.5"
+version = "0.14.6"
 
 [deps]
 CategoricalArrays = "324d7699-5711-5eae-9e2f-1d82baa6b597"
diff --git a/src/operations.jl b/src/operations.jl
index 890ddb3f..d49ae317 100644
--- a/src/operations.jl
+++ b/src/operations.jl
@@ -70,18 +70,27 @@ for operation in OPERATIONS
 
     ex = quote
         # 1. operations on machines, given *concrete* data:
-        function $operation(mach::Machine{M}, Xraw, Xraw_more...) where M
-            if mach.state > 0 || M <: Static
+        function $operation(mach::Machine, Xraw)
+            if mach.state > 0
                 return $(operation)(mach.model, mach.fitresult,
-                                    Xraw, Xraw_more...)
+                                    Xraw)
             else
                 error("$mach has not been trained.")
             end
         end
+        
+        function $operation(mach::Machine{<:Static}, Xraw, Xraw_more...)
+            isdefined(mach, :fitresult) || (mach.fitresult = nothing)
+            return $(operation)(mach.model, mach.fitresult,
+                                    Xraw, Xraw_more...)
+        end
 
         # 2. operations on machines, given *dynamic* data (nodes):
         $operation(mach::Machine, X::AbstractNode) =
             node($(operation), mach, X)
+            
+        $operation(mach::Machine{<:Static}, X::AbstractNode, Xmore::AbstractNode...) =
+            node($(operation), mach, X, Xmore...)
     end
     eval(ex)
 end
@@ -101,7 +110,7 @@ function predict_mode(m::Union{ProbabilisticComposite,ProbabilisticSurrogate},
                       fitresult,
                       Xnew)
     if haskey(fitresult, :predict_mode)
-        return fitresult.predict_mode(X)
+        return fitresult.predict_mode(Xnew)
     end
     return mode.(predict(m, fitresult, Xnew))
 end
@@ -110,7 +119,7 @@ function predict_mean(m::Union{ProbabilisticComposite,ProbabilisticSurrogate},
                       fitresult,
                       Xnew)
     if haskey(fitresult, :predict_mean)
-        return fitresult.predict_mean(X)
+        return fitresult.predict_mean(Xnew)
     end
     return mean.(predict(m, fitresult, Xnew))
 end
@@ -119,7 +128,7 @@ function predict_median(m::Union{ProbabilisticComposite,ProbabilisticSurrogate},
                       fitresult,
                       Xnew)
     if haskey(fitresult, :predict_median)
-        return fitresult.predict_median(X)
+        return fitresult.predict_median(Xnew)
     end
     return median.(predict(m, fitresult, Xnew))
 end