diff --git a/src/_igraph/graphobject.c b/src/_igraph/graphobject.c
index b6c14a340..86bd8328b 100644
--- a/src/_igraph/graphobject.c
+++ b/src/_igraph/graphobject.c
@@ -5329,6 +5329,7 @@ PyObject *igraphmodule_Graph_edge_betweenness(igraphmodule_GraphObject * self,
     igraph_vs_destroy(&sources);
     if (weights) { igraph_vector_destroy(weights); free(weights); }
     igraphmodule_handle_igraph_error();
+    return NULL;
   }
 
   if (cutoff == Py_None) {
@@ -5529,11 +5530,14 @@ PyObject *igraphmodule_Graph_feedback_arc_set(
 
   if (igraph_vector_int_init(&res, 0)) {
     if (weights) { igraph_vector_destroy(weights); free(weights); }
+    igraphmodule_handle_igraph_error();
+    return NULL;
   }
 
   if (igraph_feedback_arc_set(&self->g, &res, weights, algo)) {
     if (weights) { igraph_vector_destroy(weights); free(weights); }
     igraph_vector_int_destroy(&res);
+    igraphmodule_handle_igraph_error();
     return NULL;
   }
 
@@ -5571,11 +5575,14 @@ PyObject *igraphmodule_Graph_feedback_vertex_set(
 
   if (igraph_vector_int_init(&res, 0)) {
     if (weights) { igraph_vector_destroy(weights); free(weights); }
+    igraphmodule_handle_igraph_error();
+    return NULL;
   }
 
   if (igraph_feedback_vertex_set(&self->g, &res, weights, algo)) {
     if (weights) { igraph_vector_destroy(weights); free(weights); }
     igraph_vector_int_destroy(&res);
+    igraphmodule_handle_igraph_error();
     return NULL;
   }
 
diff --git a/src/_igraph/igraphmodule.c b/src/_igraph/igraphmodule.c
index cd57da92a..948ff0c83 100644
--- a/src/_igraph/igraphmodule.c
+++ b/src/_igraph/igraphmodule.c
@@ -784,6 +784,7 @@ PyObject* igraphmodule__enter_safelocale(PyObject* self, PyObject* Py_UNUSED(_nu
   if (igraph_enter_safelocale(loc)) {
     Py_DECREF(capsule);
     igraphmodule_handle_igraph_error();
+    return NULL;
   }
 
   return capsule;