diff --git a/src/minify.cpp b/src/minify.cpp
index 4a97000..e28ae7d 100644
--- a/src/minify.cpp
+++ b/src/minify.cpp
@@ -455,7 +455,7 @@ block* do_one_minify_single_block(block* in)
   ret = l->cls[0]->pls[0]->cmds[0];
 
   // if is a subshell and has some env set: don't remove it
-  if(in->type == _obj::block_subshell && has_env_set(in))
+  if(in->type == _obj::block_subshell && has_env_set(ret))
     return nullptr;
 
   return ret;
@@ -485,6 +485,9 @@ bool r_minify_single_block(_obj* in)
           // replace value
           delete t->cmds[i];
           t->cmds[i] = ret;
+
+          recurse(r_minify_single_block, in);
+          return false;
         }
       }
     }; break;
diff --git a/src/struc_helper.cpp b/src/struc_helper.cpp
index 1f44bff..2c26ee2 100644
--- a/src/struc_helper.cpp
+++ b/src/struc_helper.cpp
@@ -140,7 +140,7 @@ bool possibly_expands(arglist* in)
 
 bool cmd::has_var_assign()
 {
-  if(this->args->size() == 0)
+  if(this->args == nullptr || this->args->size() == 0)
   {
     return this->var_assigns.size()>0;
   }