bugfix in problem::setFirstFrameOptions

src/problem/problem.cpp

@@ -1211,7 +1211,7 @@ void Problem::setFirstFrameOptions(const TypeComposite&   _first_frame_types,
     WOLF_WARN_COND(first_frame_status_ == 1, "Overriding prior options.");
 
     // add the types of the keys that are not in frame_types_
-    appendToFrameTypes(first_frame_types_);
+    appendToFrameTypes(_first_frame_types);
 
     first_frame_types_  = _first_frame_types;
     first_frame_values_ = _first_frame_values;