diff --git a/src/exception_t.c b/src/exception_t.c
index da8cbaf..b5cea82 100644
--- a/src/exception_t.c
+++ b/src/exception_t.c
@@ -14,3 +14,8 @@ void
 exception_free(exception_t *e) {
   free(e);
 }
+
+int
+exception_null(const exception_t *e) {
+  return e->type == NO_ERROR;
+}
diff --git a/src/exception_t.h b/src/exception_t.h
index ba6af43..5be2cb7 100644
--- a/src/exception_t.h
+++ b/src/exception_t.h
@@ -21,6 +21,9 @@ exception_init();
 void
 exception_free(exception_t *e);
 
+int
+exception_null(const exception_t *e);
+
 char*
 exception_str(exception_t *e);