diff --git a/src/reactionsystem_conversions.jl b/src/reactionsystem_conversions.jl
index 9705d61773..f63735a3f5 100644
--- a/src/reactionsystem_conversions.jl
+++ b/src/reactionsystem_conversions.jl
@@ -336,7 +336,7 @@ function classify_vrjs(rs, physcales)
         empty!(rxvars)
         (rx.rate isa Symbolic) && get_variables!(rxvars, rx.rate)
         @inbounds for rxvar in rxvars
-            if isequal(rxvar, get_iv(rs))
+            if isequal(rxvar, get_iv(rs)) || (!MT.isparameter(rxvar) && !isspecies(rxvar))
                 isvrjvec[i] = true
                 havevrjs = true
                 break
@@ -401,7 +401,7 @@ function assemble_jumps(rs; combinatoric_ratelaws = true, physical_scales = noth
             end
         end
     end
-    vcat(meqs, ceqs, veqs)
+    reduce(vcat, (meqs, ceqs, veqs); init = Any[])
 end
 
 ### Equation Coupling ###
diff --git a/test/reactionsystem_core/reactionsystem.jl b/test/reactionsystem_core/reactionsystem.jl
index 3acdf008e3..18ac4d361f 100644
--- a/test/reactionsystem_core/reactionsystem.jl
+++ b/test/reactionsystem_core/reactionsystem.jl
@@ -1021,4 +1021,18 @@ let
     jprob = JumpProblem(jinput; rng)
     sol = solve(jprob)
     @test sol(10.0; idxs = :A) > 0
-end
\ No newline at end of file
+
+    rn = @reaction_network begin
+        @parameters λ
+        k*V, 0 --> A
+        @equations D(V) ~ λ*V
+        @continuous_events begin
+            [V ~ 2.0] => [V ~ V/2, A ~ rand()*A]
+        end
+    end        
+    jinput = JumpInputs(rn, [:A => 0, :V => 1.0], (0.0, 10.0), [:k => 1.0, :λ => .2])
+    @test jinput.prob isa ODEProblem
+    jprob = JumpProblem(jinput; rng)
+    sol = solve(jprob, Tsit5()) 
+
+end