diff --git a/Project.toml b/Project.toml
index 2a690d6e9..ac737944b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "LoopVectorization"
 uuid = "bdcacae8-1622-11e9-2a5c-532679323890"
 authors = ["Chris Elrod <elrodc@gmail.com>"]
-version = "0.12.135"
+version = "0.12.136"
 
 [deps]
 ArrayInterface = "4fba245c-0d91-5ea0-9b3e-6abc04ee57a9"
diff --git a/src/condense_loopset.jl b/src/condense_loopset.jl
index ab232638f..83b4dd54e 100644
--- a/src/condense_loopset.jl
+++ b/src/condense_loopset.jl
@@ -882,6 +882,7 @@ end
 @inline check_args(::LoTri) = false
 @inline check_args(::Diagonal) = false
 @inline check_args(::Type{T}) where {T} = check_type(T)
+@inline check_args(::Tuple{T,Vararg{T,K}}) where {T,K} = check_type(T)
 """
     check_type(::Type{T}) where {T}
 
diff --git a/src/modeling/graphs.jl b/src/modeling/graphs.jl
index 8afda61c2..e2aae42a3 100644
--- a/src/modeling/graphs.jl
+++ b/src/modeling/graphs.jl
@@ -623,6 +623,7 @@ function fill_children!(ls::LoopSet)
   for op ∈ operations(ls)
     empty!(children(op))
     for opp ∈ parents(op)
+      @assert children(opp) !== NOPARENTS
       push!(children(opp), op)
     end
   end
diff --git a/src/parse/add_compute.jl b/src/parse/add_compute.jl
index 9bfac67b5..1527ed1b7 100644
--- a/src/parse/add_compute.jl
+++ b/src/parse/add_compute.jl
@@ -55,6 +55,7 @@ function pushparent!(
   reduceddeps::Vector{Symbol},
   parent::Operation,
 )
+  @assert parents !== NOPARENTS
   push!(parents, parent)
   update_deps!(deps, reduceddeps, parent)
 end
@@ -299,7 +300,10 @@ function add_reduction_update_parent!(
   # create child op, which is the reduction combination
   childrdeps = Symbol[]
   childparents = Operation[op]#, parent ]
-  add_reduct_instruct && push!(childparents, parent)
+  if add_reduct_instruct
+    @assert childparents !== NOPARENTS
+    push!(childparents, parent)
+  end
   childdeps = loopdependencies(reductinit)
   setdiffv!(childrdeps, loopdependencies(op), childdeps)
   child = Operation(
diff --git a/src/parse/add_ifelse.jl b/src/parse/add_ifelse.jl
index a583efd0b..611d87ed2 100644
--- a/src/parse/add_ifelse.jl
+++ b/src/parse/add_ifelse.jl
@@ -30,7 +30,11 @@ function add_if!(
        all(ld -> ld ∈ loopdependencies(trueop), loopdependencies(condop)) &&
        !search_tree(parents(condop), trueop)
       trueop.instruction = Instruction(:conditionalload)
-      push!(parents(trueop), condop)
+      if parents(trueop) !== NOPARENTS
+        push!(parents(trueop), condop)
+      else
+        trueop.parents = [condop]
+      end
     end
   else
     trueop = getop(ls, iftrue, elementbytes)
@@ -50,7 +54,12 @@ function add_if!(
        all(ld -> ld ∈ loopdependencies(falseop), loopdependencies(condop)) &&
        !search_tree(parents(condop), falseop)
       falseop.instruction = Instruction(:conditionalload)
-      push!(parents(falseop), negateop!(ls, condop, elementbytes))
+      negop = negateop!(ls, condop, elementbytes)
+      if parents(falseop) !== NOPARENTS
+        push!(parents(falseop), negop)
+      else
+        falseop.parents = [negop]
+      end
       if (any(==(identifier(trueop)), Iterators.map(first, ls.preamble_zeros)))
         falseop.variable = LHS
         ls.opdict[LHS] = falseop
diff --git a/test/grouptests.jl b/test/grouptests.jl
index 74c66b161..db31402c1 100644
--- a/test/grouptests.jl
+++ b/test/grouptests.jl
@@ -9,6 +9,7 @@ const START_TIME = time()
   @time if LOOPVECTORIZATION_TEST == "all" || LOOPVECTORIZATION_TEST == "part1"
     @time include("broadcast.jl")
     @time include("parsing_inputs.jl")
+    @time include("misc2.jl")
   end
 
   @time if LOOPVECTORIZATION_TEST == "all" || LOOPVECTORIZATION_TEST == "part2"
diff --git a/test/misc2.jl b/test/misc2.jl
new file mode 100644
index 000000000..a540dbc5c
--- /dev/null
+++ b/test/misc2.jl
@@ -0,0 +1,20 @@
+
+using LoopVectorization, Test
+
+function tuptestturbo(x,y,t)
+  s = 0.0
+  @turbo for i = eachindex(x,y)
+    s += x[i]*t[1] - y[i]*t[2]
+  end
+  s
+end
+function tuptest(x,y,t)
+  s = 0.0
+  @inbounds @fastmath for i = eachindex(x,y)
+    s += x[i]*t[1] - y[i]*t[2]
+  end
+  s
+end
+x = rand(127); y = rand(127); t = (rand(),rand());
+@test tuptestturbo(x,y,t) ≈ tuptest(x,y,t)
+