diff --git a/src/grr_utils.jl b/src/grr_utils.jl
index cfa6dec..eb9da5d 100644
--- a/src/grr_utils.jl
+++ b/src/grr_utils.jl
@@ -24,7 +24,7 @@ const grr_grammar = begin
             p(m[i]) || break
             last = i
         end
-        last
+        return last
     end
 
     # eat one of keywords
diff --git a/src/interface.jl b/src/interface.jl
index d9c128d..d25b33a 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -210,7 +210,7 @@ function Base.convert(::Type{JSONFBCModel}, mm::A.AbstractFBCModel)
             I, V = findnz(S[:, ri])
             res["metabolites"] =
                 Dict{String,Float64}([met_ids[ii] => vv for (ii, vv) in zip(I, V)])
-            res
+            identity(res)
         end for (ri, rid) in enumerate(rxn_ids)
     ]
 
diff --git a/src/utils.jl b/src/utils.jl
index ec052ef..aa913fb 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -40,8 +40,8 @@ function parse_annotations_or_notes(x)
     for (k, vs) in x
         if isa(vs, String)
             a_or_n[k] = String[vs]
-        else
-            a_or_n[k] = String[v for v in vs]
+        elseif isa(vs, AbstractDict) || isa(vs, AbstractVector)
+            a_or_n[k] = String[string(p) for p in collect(vs)]
         end
     end
     return a_or_n