1 files changed, 10 insertions, 3 deletions
diff --git a/src/SetSym.c b/src/SetSym.c
index ee181eb..31d39d3 100644
--- a/src/SetSym.c
+++ b/src/SetSym.c
@@ -8,6 +8,8 @@
    @enddesc
  @@*/
 
+#include <stdlib.h>
+
 #include "cGH.h"
 #include "CactusBase/CartGrid3D/src/Symmetry.h"
 
@@ -221,7 +223,12 @@ Cartoon_SetSym_BSSN(CCTK_ARGUMENTS)
 
   }
 
-  free(evolution_system);
-  free(evolution_method);
-
+  if (evolution_system)
+  {
+    free(evolution_system);
+  }
+  if (evolution_method)
+  {
+    free(evolution_method);
+  }
 }