diff --git a/src/features/alias_elements/libsbmlnetwork_alias_reaction.cpp b/src/features/alias_elements/libsbmlnetwork_alias_reaction.cpp
index 83386f4..a558104 100644
--- a/src/features/alias_elements/libsbmlnetwork_alias_reaction.cpp
+++ b/src/features/alias_elements/libsbmlnetwork_alias_reaction.cpp
@@ -55,6 +55,8 @@ namespace LIBSBMLNETWORK_CPP_NAMESPACE {
                     for (unsigned int stoichiometryIndex = 0; stoichiometryIndex < stoichiometry; stoichiometryIndex++)
                         alias_element_createAliasSpeciesReferenceGlyph(reactionGlyph, speciesReferenceGlyph,
                                                          connectedSpeciesGlyph->getId(), stoichiometryIndex);
+
+                    return 0;
                 }
             }
         }
diff --git a/src/libsbmlnetwork_sbmldocument.cpp b/src/libsbmlnetwork_sbmldocument.cpp
index 72b5d34..76c690f 100644
--- a/src/libsbmlnetwork_sbmldocument.cpp
+++ b/src/libsbmlnetwork_sbmldocument.cpp
@@ -69,6 +69,15 @@ namespace LIBSBMLNETWORK_CPP_NAMESPACE  {
         return false;
     }
 
+    bool freeUserData(SBMLDocument* document) {
+        if (document) {
+            user_data_freeUserData(document);
+            return true;
+        }
+
+        return false;
+    }
+
     bool isSetModel(SBMLDocument* document) {
         if (document)
             return document->isSetModel();
diff --git a/src/libsbmlnetwork_sbmldocument.h b/src/libsbmlnetwork_sbmldocument.h
index 7dd5115..6326bb7 100644
--- a/src/libsbmlnetwork_sbmldocument.h
+++ b/src/libsbmlnetwork_sbmldocument.h
@@ -66,6 +66,11 @@ LIBSBMLNETWORK_EXTERN void clearErrorLog(SBMLDocument* document);
 /// @return boolean value indicating success/failure of the function.
 LIBSBMLNETWORK_EXTERN bool freeSBMLDocument(SBMLDocument* document);
 
+/// @breif Free the user data of the given SBML document.
+/// @param document a pointer to the SBMLDocument object.
+/// @return boolean value indicating success/failure of the function.
+LIBSBMLNETWORK_EXTERN bool freeUserData(SBMLDocument* document);
+
 /// @brief Returns true if the Model object has been set, otherwise returns false.
 /// @param document a pointer to the SBMLDocument object.
 /// @return true if the Model object has been set, otherwise returns false.