1 files changed, 10 insertions, 3 deletions
diff --git a/src/Utils.c b/src/Utils.c
index 4870d61..e3b0274 100644
--- a/src/Utils.c
+++ b/src/Utils.c
@@ -951,8 +951,12 @@ ioRequest *IOUtil_DefaultIORequest (const cGH *GH, int vindex,
 
   /* get the variable's dimension and extents */
   request->vdim = CCTK_GroupDimFromVarI (vindex);
-  extent_int = malloc (request->vdim * sizeof (int));
-  CCTK_GroupgshVI (GH, request->vdim, extent_int, vindex);
+  extent_int = NULL;
+  if (request->vdim > 0)
+  {
+    extent_int = malloc (request->vdim * sizeof (int));
+    CCTK_GroupgshVI (GH, request->vdim, extent_int, vindex);
+  }
 
   /* allocate the arrays all in one go
      only initialize those which are mandatory for the Hyperslab API */
@@ -991,7 +995,10 @@ ioRequest *IOUtil_DefaultIORequest (const cGH *GH, int vindex,
   }
 
   /* clean up */
-  free (extent_int);
+  if (extent_int)
+  {
+    free (extent_int);
+  }
 
   return (request);
 }