1 files changed, 2 insertions, 1 deletions
diff --git a/src/option.h b/src/option.h
index 787d34ae..639f049b 100644
--- a/src/option.h
+++ b/src/option.h
@@ -106,7 +106,8 @@ public:
 
   string& str() {
     assert(handled);
-    assert(value);
+    if (! value)
+      throw_(std::runtime_error, "No argument provided for " << desc());
     return value.as_string_lval();
   }