diff --git a/modules/bilevel/solvebilevel.m b/modules/bilevel/solvebilevel.m
index 3446ddc4..1ace1294 100644
--- a/modules/bilevel/solvebilevel.m
+++ b/modules/bilevel/solvebilevel.m
@@ -57,6 +57,10 @@
     end
 end
 
+if numel(OuterObjective) > 1  || numel(InnerObjective) > 1
+    error('The objective functions have to be scalar functions');
+end
+
 % User wants to use fmincon, cplex or something like
 if strcmp(options.bilevel.algorithm,'external')
     % Derive KKT conditions of inner problem, append with outer, and solve