diff --git a/src/vm.c b/src/vm.c
index 44ac77f18..adb943961 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -231,6 +231,7 @@ cipush(mrb_state *mrb)
   ci->ridx = ridx;
   ci->env = 0;
   ci->pc = 0;
+  ci->err = 0;
 
   return ci;
 }