1 files changed, 3 insertions, 2 deletions
diff --git a/src/CoordBase.c b/src/CoordBase.c
index c53837a..c73f438 100644
--- a/src/CoordBase.c
+++ b/src/CoordBase.c
@@ -10,7 +10,7 @@
 
 #include <string.h>
 #include <stdlib.h>
-#include <assert.h>
+
 
 #include "cctk.h"
 #include "util_Table.h"
@@ -552,7 +552,8 @@ CCTK_INT CoordBase_GroupSystem(CCTK_POINTER_TO_CONST GH,
 
     /* Check for a default for all GF variables of this dimension */
     gindex = CCTK_GroupIndex(groupname);
-    assert(gindex>=0);
+    if(gindex<0)
+      CCTK_VWarn ( 0, __LINE__, __FILE__, "CoordBase", "group index is out of bounds");
     if (system_handle == -9999 && CCTK_GroupTypeI(gindex) == CCTK_GF)
     {
       GHex = CCTK_GHExtension(GH,"CoordBase");