1 files changed, 6 insertions, 2 deletions
diff --git a/src/Output1D.c b/src/Output1D.c
index b0e73c5..b780e26 100644
--- a/src/Output1D.c
+++ b/src/Output1D.c
@@ -117,8 +117,12 @@ int IOASCII_Output1DVarAs (const cGH *GH, const char *fullname, const char *alia
 
   retval = -1;
   vindex = CCTK_VarIndex (fullname);
-
-  if (CheckOutputVar (vindex))
+  if (vindex<0)
+  {
+    CCTK_VWarn (1, __LINE__, __FILE__, CCTK_THORNSTRING,
+		"There is no such variable %s.  Ignoring IOASCII 1D output.",
+		fullname);
+  } else if (CheckOutputVar (vindex))
   {
     retval = IOASCII_Write1D (GH, vindex, alias);
   }